The Collaborative International Dictionary of English v.0.48:

Tiff \Tiff\, v. i. [imp. & p. p. Tiffed; p. pr. & vb. n.
   Tiffing.]
   To be in a pet.
   [1913 Webster]

         She tiffed with Tim, she ran from Ralph. --Landor.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tiff \Tiff\, v. t. [OE. tiffen, OF. tiffer, tifer, to bedizen;
   cf. D. tippen to clip the points or ends of the hair, E. tip,
   n.]
   To deck out; to dress. [Obs.] --A. Tucker.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tiff \Tiff\, n. [Originally, a sniff, sniffing; cf. Icel. ?efr a
   smell, ?efa to sniff, Norw. tev a drawing in of the breath,
   teva to sniff, smell, dial. Sw. t["u]v smell, scent, taste.]
   1. Liquor; especially, a small draught of liquor. "Sipping
      his tiff of brandy punch." --Sir W. Scott.
      [1913 Webster]

   2. A fit of anger or peevishness; a slight altercation or
      contention. See Tift. --Thackeray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tiff
    n 1: a quarrel about petty points [syn: bicker, bickering,
         spat, tiff, squabble, pettifoggery, fuss]

The Free On-line Dictionary of Computing (19 January 2023):

Tagged Image File Format
TIFF

    (TIFF) A file format used for
   still-image bitmaps, stored in tagged fields.  Application
   programs can use the tags to accept or ignore fields,
   depending on their capabilities.

   While TIFF was designed to be extensible, it lacked a core of
   useful functionality, so that most useful functions (e.g.
   lossless 24-bit colour) requires nonstandard, often
   redundant, extensions.  The incompatibility of extensions has
   led some to expand "TIFF" as "Thousands of Incompatible File
   Formats".

   Compare GIF, PNG, JPEG.

   (1997-10-11)