The act of shoving one's grenade-resembling hand into a man or woman's orifice and then opening it with fingers flailing wildly in a mock explosion.
Kevin: Wow, being grenaded by my girlfriend last night left my ***hole gaping!

Gerald: Eek, that sounds terrible.

Kevin: Nah dude, I loved it!

Gerald: Hmm, maybe I should try some grenading...
by Gina Castell July 20, 2009
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Jersey Shore Term. The ugly friend that tags along with a smokin' hot chick. In a way she explodes and that affects the friend she's with so she's also a cock block. Really ruins the mood. Makes you feel like you're being closely observed by a gay friend. She can also be the wing-girl. Just in case there's a double-team comin' along.
My friend ended up gettin with a hot chick, while I was stuck with the Grenade.
by Hakrim August 1, 2010
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ugly/fat chick out of the group of chicks.
Situation: Looks like we got a situation here.
Pauly D: Yeah we do
Situation: Alright heres the plan, we extract the grenade from that room, put her in a separate room for her to explode (sleep).

Pauly D: Alright then?
Situation: Then we extract the hotties n take em to our room. Sounds like a plan?
Pauly D: Yeah lets do it, GFA!.
by ThatGrenadeSituation September 19, 2010
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A grenade is what the fat ugly bitch that is with a group of fine ass women is called. If she gets upset then it "blows up" the time for the rest of the girls in the group or the guys trying to get with them.
Dude go lay on that Grenade for us she is about to get pissy and its gonna fuck it up for all of us!
by Greatest EVR August 18, 2010
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Describes something that is the best and/or kicks some serious ass.
Replacing the dead phrase Da Bomb.
Scoot:That girls ass is sooooo grenades!

Brian: Yea, I would love to pee in her butt
by Eric D. March 16, 2005
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A grenade is a fat, ugly chick. This term was believed to be first released on "Jersey Shore", when Mike "The Situation" referred to the best friend of a girl he brought home as a "grenade".
Mike: Dude, I feel bad for Pauly D right now... he needs to entertain the grenade!
by JerseyShoreLover August 10, 2010
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An unattractive and mildly overweight female that tags along with their hot friend/friends. Can often be spotted at a club holding back her friends from any potential action.
Yo Frankie, can you take care of that grenade while I go for that fine Indian brunette with the banging body?

Bro, last week I took a grenade for you, its your turn tonight!

Grenade-Free America!
by Doc Sus January 11, 2012
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