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1.
(noun.) uncontrollable hairtrigger laughter. known to occur at slumber parties after the topless pillowfight.
after we started talking about how weird our chemistry teacher is, tamara flung a tampon at jamie. after that it was pretty much a nonstop gigglefest
by king kong NINJA April 20, 2004
 
2.
uncontrollable laughter
a laughing disorder
what you get when you laugh a lot

a party where you just laugh
pejman and marisa send out invitations to their giggle-fests

ooh that just gave me a giggle-fest
by Pejaman and Marisa September 03, 2006