The Collaborative International Dictionary of English v.0.48:

Sling \Sling\, v. t. [imp. Slung, Archaic Slang; p. p.
   Slung; p. pr. & vb. n. Slinging.] [AS. slingan; akin to
   D. slingeren, G. schlingen, to wind, to twist, to creep, OHG.
   slingan to wind, to twist, to move to and fro, Icel. slyngva,
   sl["o]ngva, to sling, Sw. slunga, Dan. slynge, Lith. slinkti
   to creep.]
   1. To throw with a sling. "Every one could sling stones at an
      hairbreadth, and not miss." --Judg. xx. 16.
      [1913 Webster]

   2. To throw; to hurl; to cast. --Addison.
      [1913 Webster]

   3. To hang so as to swing; as, to sling a pack.
      [1913 Webster]

   4. (Naut) To pass a rope round, as a cask, gun, etc.,
      preparatory to attaching a hoisting or lowering tackle.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slang \Slang\,
   imp. of Sling. Slung. [Archaic]
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The Collaborative International Dictionary of English v.0.48:

Slang \Slang\, n.
   Any long, narrow piece of land; a promontory. [Local, Eng.]
   --Holland.
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The Collaborative International Dictionary of English v.0.48:

Slang \Slang\, n. [Cf. Sling.]
   A fetter worn on the leg by a convict. [Eng.]
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The Collaborative International Dictionary of English v.0.48:

Slang \Slang\, n. [Said to be of Gypsy origin; but probably from
   Scand., and akin to E. sling; cf. Norw. sleng a slinging, an
   invention, device, slengja to sling, to cast, slengja kjeften
   (literally, to sling the jaw) to use abusive language, to use
   slang, slenjeord (ord = word) an insulting word, a new word
   that has no just reason for being.]
   Low, vulgar, unauthorized language; a popular but
   unauthorized word, phrase, or mode of expression; also, the
   jargon of some particular calling or class in society; low
   popular cant; as, the slang of the theater, of college, of
   sailors, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slang \Slang\, v. t. [imp. & p. p. Slanged; p. pr. & vb. n.
   Slanging.]
   To address with slang or ribaldry; to insult with vulgar
   language. [Colloq.]
   [1913 Webster]

         Every gentleman abused by a cabman or slanged by a
         bargee was bound there and then to take off his coat
         and challenge him to fisticuffs.         --London
                                                  Spectator.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slang
    n 1: informal language consisting of words and expressions that
         are not considered appropriate for formal occasions; often
         vituperative or vulgar; "their speech was full of slang
         expressions" [syn: slang, slang expression, slang
         term]
    2: a characteristic language of a particular group (as among
       thieves); "they don't speak our lingo" [syn: slang, cant,
       jargon, lingo, argot, patois, vernacular]
    v 1: use slang or vulgar language
    2: fool or hoax; "The immigrant was duped because he trusted
       everyone"; "You can't fool me!" [syn: gull, dupe,
       slang, befool, cod, fool, put on, take in, put
       one over, put one across]
    3: abuse with coarse language

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "slang":
   Aesopian language, Babel, Greek, argot, babble, barbarism, bluff,
   bluster, bluster and bluff, bounce, brag, bully, cant, cipher,
   code, colloquialism, common speech, corruption, cryptogram,
   double Dutch, garble, gasconade, gibberish, gift of tongues,
   glossolalia, gobbledygook, hector, illiterate speech, impropriety,
   intimidate, jargon, jargonal, jargonish, jumble, lingo, localism,
   mumbo jumbo, noise, out-herod Herod, patois, patter, phraseology,
   rage, rant, rave, roister, rollick, scatological, scatology,
   scramble, secret language, slangy, splutter, sputter, storm,
   substandard language, swagger, swashbuckle, taboo, taboo language,
   taboo word, vapor, vernacular, vocabulary, vulgar language,
   vulgar tongue, vulgarism, vulgate



The Free On-line Dictionary of Computing (30 December 2018):

SLANG

   1. R.A. Sibley.  CACM 4(1):75-84 (Jan 1961).

   2. Set LANGuage.  Jastrzebowski, ca 1990.  C extension with
   set-theoretic data types and garbage collection.  "The SLANG
   Programming Language Reference Manual, Version 3.3",
   W. Jastrzebowski , 1990.

   3. Structured LANGuage.  Michael Kessler, IBM.  A language
   based on structured programming macros for IBM 370 assembly
   language.  "Project RMAG: SLANG (Structured Language)
   Compiler", R.A. Magnuson, NIH-DCRT-DMB-SSS-UG105, NIH, DHEW,
   Bethesda, MD 20205 (1980).

   4. "SLANG: A Problem Solving Language for Continuous-Model
   Simulation and Optimisation", J.M. Thames, Proc 24th ACM Natl
   Conf 1969.


The Devil's Dictionary (1881-1906):

SLANG, n.  The grunt of the human hog (_Pignoramus intolerabilis_)
with an audible memory.  The speech of one who utters with his tongue
what he thinks with his ear, and feels the pride of a creator in
accomplishing the feat of a parrot.  A means (under Providence) of
setting up as a wit without a capital of sense.