1.) To break something beyond repair. Usually some technical piece of equipment.
2.) To injure yourself in a way that no one can comprehend. Such as tripping over a tree stump in the middle of a walking path.
If this installation doesn't go well, I'm going to shawlefy it.
According to Bud Light advertising officials, to fall on the grenade means to choose the more intellectual of the two scantily clad, leggy, voluptious super models cast to play bicurious friends opposite you and your equally unattractive, slightly overweight beer drinking cohort. Forcing you to sit and drink bud light whilst tuning out the dull, empowered, feminist rambling of the prude, abercrombie wearing, never-going-to-fuck-you hottie, while your buddy drinks bud light and dances his way into the looser hottie's panties. The intellectual one is always wearing glasses. Still you have a chance to possibly fuck the prude if you feign interest and agree to every fucking thing she says, but do you want to? Make sure not to drink too much bud light, no matter how long this bitch rambles on. You must be conscious to get the fuck out of there after she falls asleep or you're in for a hellish morning after.
Jim met Judy and Betty at the bar and bought them each bud lights so the responsibility fell on me to fall on the grenade and work for my pussy.