cunt shun
The female version of "cock block". A female who, inadvertently or not, prevents another female from entering into a situation where the prospect of fornication is imminent.
"Dude you just cunt shunned Lenora! You're supposed to be guiding her cunt not shunning it!"
"Briony is a prize cunt shun."
"Briony is a prize cunt shun."