1: When a vagina and anal cavity create the same odor.
2: A vagina sits on the bare ground exposed to the elements (usually grass and such will leave evidence)
When having sexmissionary, you reach around and between your partners legs and wet your finger with pussy juice from her taint, you use this as lube and stick your finger in her asshole. you now have pussy-butt finger.
a chick that is so depraved that the only way she can get off is by being aggravatingly fucked in her ass while she violently slaps her own clit or pussy, usually ends up to be a porn star.
James thought Jamie was a prude, but as soon as she broke upwith him she turned into a pussy slappin' butt fucker. I guess she just did not like him.