An ugly girl of the hot friend. Usually has some unsightly repulsive characteristic such as a large nose, forehead or just plain unnatractive looks.

Gets ignored when out. Has her own male friends hitting on the hotter girl in front of her eyes and behind her back.

Grenades usually end up nowhere in life due to their unnatractive physical characteristics and lack of common sense.
That poor grenade came back to get revenge.
by your name here.., January 28, 2009
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when a girl is sucking ur testicles and she rips one off like a grenade tip.
ayeee ur girl grenaded you?
by im me. January 11, 2010
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(noun)—a lady friend of a potential conquest who blocks your advances on their friend's behalf. Please Note: a wingman may be needed to "dive on the grenade".
"There's one huge grenade launcher, there's one grenade, and then there's one cutie."—Mike "The Situation," Jersey Shore
by NEW JERSEY Diet-SHORE-nary April 13, 2011
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Someone who, like a good soldier, will hop on a "grenade" (ugly girl) and take all necessary damage from said decision to ensure a buddy can score with said grenade's much more attractive friend.

SIDE NOTE: Bonus points if you get a BJ and her name is dyke-ish, like Becky or Barbara but goes by Barbie or something much sexier.
JJ: Look at that blonde over there.
Adam: Yeah, but her friend is fugly.
JJ: You owe me man.
Adam: Dammit, I'll be the Grenader.
by Fatz39 January 18, 2012
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Ronnie gets in a fight with Sammie on the hit show Jersey Shore and starts hooking up with Grenades and Land mines
by ForTheThrill August 1, 2010
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(noun)—a large lady, of an unsightly nature. Please Note: a wingman may be needed to "dive on the grenade".
"There's one huge grenade launcher, there's one grenade, and then there's one cutie."—Mike "The Situation," Jersey Shore
by NEW JERSEY Diet-SHORE-nary April 13, 2011
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A grenade is a cockblocker who is hating on a player. Grenade usually is addressed as being female. A female who is a cockblocker hating on a player. A player hatress
the woman may choose to be a grenade for various reasons. Typically a girl who is unhappy and would destroy chances of her friends getting laid. I have experienced some grenade cockblockers desroy possible chances of getting laid because they couldn't get any play and they wanted everyone else not to also. this type could be a good sport and let everyone else get laid however when and if they are fat and unhealthy they cannot do the right thing by not destroying everyone elses chances. I suggest you find a wingman to cover the grenade. a wingman like a man saving his troop from blowing up may cover the grenade by keeping her distracted while the players can spit their game so they can get what they want from the other women.
by Clinton Ziza Smith May 12, 2006
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