Similar to jumping the grenade whereby your wing man distracts the unattractive friend so you can hit on the attractive one, only in this case the unattractive friend is severely mentally and/or physically handicapped.
His wing man, valiantly jumping the plasma grenade, endured drool and stiff upper limbs so that he could chat up her caregiver.
An action performed by the wing man, this situation arises when the said wing man takes one for the team by hitting on the fat/ugly chick in order to help his buddy/buddies score with her hot friends, and therefore, sacrifices himself by jumping onto the grenade.
The pin is said to be removed from the grenade when one man goes in alone, and the grenade prevents further interaction with the hot chick(s). Therefore, the jumping of the grenade must be performed immediately before all soldiers are blown to smithereens.
The hot chick's fat friend was successful in cock blocking me because by the time my wing man was jumping the grenade, his coverage was not sufficient enough to protect us from the explosion. Attempts in obtaining intel (phone number, email address, conversation, dancing, etc...) have been thwarted.
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The act of hooking up with the Fat and or Ugly Girl who is going to tell her hot friend she can't hook up with your buddy. You know, that one nasty chick who is all bitchy right up to the time she realizes she is actually gonna get laid, then she is suddenly cool.
"Buddy, will you jump the grenade and start giving that nasty chick some attention before she claims she has to go home?" "Yeah but if I have to stick in her butt again I'm gonna be pissed"!!!
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Acting as a wingman. The phrase comes from the military; jumping on top of an active grenade will kill you but save your comrades around you as a result of it. It's a selfless act for your buddy.
Hey check out those two chicks sitting at the bar. It's a shame only one of them looks decent. Man, will you please jump grenade for me? I did it for you last time.
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To occupy (especially through sexual activity) a hot chick's ugly friend so that your friend can score with the hot one
Hey, Kevin, you mind jumping grenade so I can hook up with the hottie in red?
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A female in a group or in a pair, that's not attractive. The one no one wants. But since she's not attractive and doesn't get the same attention as her hotter friends she gets jealous and turns into a cock block.
"I was hangin out with a buddy and took one for the team, jumped on the grenade to divert her attention."
The generous act of flirting or even dating a certain individual to distract them from, and possibly loose interest in a different individual (usually a friend).
Guy 1: hey man, I need to ask you a favor. I think Nicole is hitting on me.
Guy 2: need me to jump on a grenade?
Guy 1: I mean if you could that would be great. I don't wanna date someone who smells like celery, and I don't want to explain why.
Guy 2: I got you man.