The freshly churned residue in or around a woman's hoo-haa after furious bunny humping. Notably, a smooth consistency and slightly off-white color are what relate it to butter.
Damn woman, that was hot, now go clean off that pussy butter and lets leave this toilet stall and go back to the paaarrrty!
Pussy Butter happens when a female has multiple yeast infections at the same time or in sucsession, doesn't take care of them, and doesn't clean her twat.
Natalie is fucking disgusting, she never showers and she smells like yeast; I'll bet any money that she has pussy butter in her pants.