iron coochie
The act of a girl who you just cannot seduce, as much as you try to get in her pants she has an iron coochie and you will not be able to penetrate the target.
Justin: Damn, Liam do you see that chick over there I fuck the shit out of her!
Liam: nah dude she's hot but she is an iron coochie!
Justin: damn.
Liam: nah dude she's hot but she is an iron coochie!
Justin: damn.