The act of not fully wiping after dropping a duece and then commencing to fart in a persons general direction. sending tiny feces shrapnel everywhere.
Holy shit! He just left off a huge butt grenade.

look out, a butt grenade!
by Str8sk8r June 14, 2010
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dude, i need a new toilet, i had another butt grenade go off!!
by the muffin man :) January 25, 2009
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What happens to your dookie chute after consuming White Castle Slider's.
Kim ate White Castle and began to drop BUTT GRENADE'S shortly thereafter.
by smoothupinya_WI October 2, 2021
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