two hotties came into the bar with their [troll] in tow; i decided to fall on the grenade so that ken and matt could get laid by the hotties
the selfless act of working your way into the pants of a fat ugly female troll so that your buddy can get laid by her more-appealing ladyfriend
"two hotties came into the bar with their [troll] in tow; i decided to fall on the grenade so that ken and matt could get laid by the hotties" What is the definition of "fall on the grenade"?