Top Definition
the ultimate in hilarious, signified by the special first character, a "G"

a) kelly, that was gilarious!
b) you are incredibily gilarious
c) oh, thats better than hilarious, thats Gilarious!!
by beingdevious September 15, 2005
When you giggle because something is so damn hilarious
- gawd he was so worried when I said what I was doing *ghahahagigglemorph*
- so gilarious!
by Jedia July 26, 2012
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