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.
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   2. To throw; to hurl; to cast. --Addison.
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   3. To hang so as to swing; as, to sling a pack.
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   4. (Naut) To pass a rope round, as a cask, gun, etc.,
      preparatory to attaching a hoisting or lowering tackle.
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WordNet (r) 3.0 (2006):

slinging
    n 1: throwing with a wide motion (as if with a sling)