Top Definition
When a group of guys go to mack on a group of girls, the guy who jumps on the grenade is the guy who goes after the fat chick in the group to clear the way for his friends to go after the hot ones. Usually guys take turns
"Man I ain't jumping on the grenade this timn. I did it last time"
de mur11 29 juillet 2006
1 more definition
A term used when a wingman takes the ugly girl interested in you, leaving you open to swoop in for her more attractive friend.
Me: Her friend is so hot, but the ugly girl is into me
Wingman: I'll take her off your hands so you can try the hot girl
Me: Thanks for jumping on the grenade, man. I owe you.

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