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1.
when a group of ugly fat girls are walking your way, when there is alot of ugly ass girls in one place
oh shit grenade alert
that mall is on grenade alert
by the situation aka la situacion November 26, 2010
 
2.
The sight of spotting a ugly girl in a group full of hotties the grenade is the one who get's no attention from the guys
Group of guys are in the club and spot four hot girls walking threw the door but notice a fifth chick with them one of the guys points at the girl and says look Grenade Alert
by Wild Stallion :3 January 06, 2011