Jumping On The Grenade Edit Meaning

1.

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"

See fat girl, taking one for the team, ugly girl