When two or more individuals run around and grab each others asses while laughing hysterically
Teacher: Where are mario and favian
Student: They're probably ditching class and playing giggly grab ass
by Darkness211 March 24, 2009
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A day when a group of men that want to grab women's butts. Usually on a Friday.
Man: Dude its Grab Ass Friday again!
Man 2: Nice, today is going to be a good day.
by funu555 September 28, 2014
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A sport in which one yells "ULTIMATE GRAB-ASS," at which point everyone in the room (or immediate area) starts to grab someone else's ass, while protecting your own ass at the same time. Sometimes it is paired with "The Floor is Lava" for extra epicness.
Dude, remember playing Ultimate Grab-Ass last night?

Oh yeah, man. I rocked that game. My ass didn't get grabbed once.
by ezuck August 23, 2011
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Jessica: why did you grab my ass?
Noah: it’s grab ass december!
by December 2, 2020
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Once a month on a Monday. You choose. It’s on a Monday because it helps you get through all the shit Mondays throw at you.
by Ctinez October 6, 2018
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