When a guy blocks a guy from having sex they are called a cock blocker but when a girl blocks/ stops another girl from having sex they are called a twat swater.
A very ignorant girl who blocks the penis from your vagina by saying things you can not bounce back from.
"Dude, Jenny is such a twat swatter. She totally ruined my game."
"Excuse me, when did you become such a Twat Swatter. I almost had him in the sack"
"Last week, Me and Carmen were at the club and i was totally throwing out my game and Carmen just skips on over and says, Hey Krystal, How are your aids? She's such a Twat Swatter"
Rachel: Cindy is such a twat-swatter, she would let me hook up with Adam because she told him I have crabs.
Susan: But you totally don't!
Rachel: I know!