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When you see a hott ass girl mackin it with/dating a dude and you have no idea how that dude is mackin it with/dating that girl cause hes ugly and looks like he should be dating a tree stump instead.
-Yo that girl Michelle is mad fine, I wanna get with her.
-I know man but I saw her boyfriend and hes a total man grenade.
by Jimmy Nickson September 30, 2010
1: a male cameltoe
2: a male package visible through his pants
"Why does he have to wear spandex? You can see his man grenade from here."
by Tim W February 09, 2006
The cock blockin Fat chick you have to jump on so your buddy can get the hottie.
"This fat bitch has been cock blockin me all night I need you to jump on the man grenade"

by alphamale70 February 24, 2008
A loose cannon, liable to go off at any time causing severe damage to those around him. Often found armed with a brown paper bag of exceptionally strong skuzz.
Christ alive, check out Mangrenade... That shit can't be legal!
by sweet September 08, 2003