Any definition on Urban Dictionary where a word totally random or innocent can be turned into a slang for drugs/"body parts" or something during sex (see examples).
Santa Claus - After copulation, a partner makes a mustache and/or beard with semen on the other partner.
Bubble - a females ass, preferably big
carpet - the thick, knotted mass of pubic hair just north of the vagina.
alaskan firedragon - When a man is just about to ejaculate while recieving oral sex, he pushes down the woman's head, leans in and says something shocking such as "I have herpes." The woman will choke and try to pull back. The man then ejaculates into the back of her throat while she is choking, forcing the semen through her nostrils. This is similar to laughing while drinking milk.
All these are real stupid definitions on urban dictionary by the way.