Definition of "GIF"

GIF

/d͡ʒɪf/

noun
plural GIFs
1. (computing) A bitmap image format for pictures with support for multiple images per file or animations, and up to 256 distinct colors per frame, including a fully transparent color.
2. An image encoded in GIF file format; the resulting file.
3. (Internet slang, loosely) Any short video without audio, usually one which loops.
4. (Internet, by extension) Any short video, in a format directly supported by HTML5 (ie. GIF, MP4, WebM)
verb
third-person singular simple present GIFs, present participle GIFing, simple past and past participle GIFed
1. To create a GIF file of (an image or video sequence, especially relating to an event).
  Quotations
  In fact, it seems this latest round of interest in the 2011 cover was sparked by the GIF-ing of Lawrence’s pre- and post-Photoshopped image, which made the rounds on Tumblr before seeping out to blogs like Crushable.
  2013 December 16, Caitlin Dewey, “Two-year-old Photoshopped Jennifer Lawrence magazine cover draws criticism”, in The Washington Post‎