Like 'butter face', but instead of a hot body with an ugly face, the person possesses exceptionally good looks but a small/not so good looking crotch. For men, common terms would be 'pencil dick' or 'baby penis'. Women, terms like 'blue waffle' or the favorite 'stink tuna'.
Jake: Dude, I swear Amanda is so freakin' hot! I'm really considering getting in bed with her tonight.
Dave: Ehh, yeah she's good looking, but I wouldn't bang. Word is she's a butter crotch.
Dave: Yep. Her clitoris looks like chewed up bubble gum. Pretty sick man.
When I asked Veronica if she was a natural blonde, she pulled down her pants and said "Yup. I'm a Butter Crotch."
That one blonde girl who works the shift at Subway with me? She doesn't shave; she's a full-blown buttercrotch.
When a woman's vagina tastes like Werther's.
Tom: Did you hook up with that girl from the party last night?
Dave: Yeah, but she was had a buttercrotch.
If my grandparents were still sexually active, I bet my grandfather would brag that my grandmother has a buttercrotch.
You know when you meet a girl and everything about her is great, except her vagina is fucking destroyed? Yes.
Hot dog down a hallway. Buttercrotch.