The act of a female removing a used tampon from her vagina and throwing it at someone, typically in the course of an argument but could also be used as a prank.
Jenny and Susie were fighing in 3rd period.... Jenny even threw a crimson grenade!
by Only1mrfstr July 11, 2015
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To remove one's tampon and hurl it at one's target.
Shit escalated to the point where this one bitch dropped a crimson grenade.
by lonely_internet_loser July 11, 2015
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When a woman takes out her tampon and throws it to her victim.
I was just hit with a crimson grenade, I must go.
by supertavs July 11, 2015
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When two high school girls are in a fight, and one pulls out her tampon and flings it like a grenade at the other.
"Hey Mark, you hear about that fight earlier?"

"Yeah man, I heard Suzy used the ol' Crimson Grenade on that bitch"
by Rk1859 July 11, 2015
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