Milkshake

A fetish sex act where one partner rapidly swirls his penis inside his partner's anus until finally ejaculating, at which point a cup is place beneath the anus and the cum (mixed with butt junk) that is inside is allowed to drip out of it and into the cup.* A straw is then placed in the cup and one or both partners drink from it. It is often used as a humiliation tactic with the man forcing the woman to drink the milkshake or simply throwing it in her face when she turns around to look at it. *Note: There are varying "flavors" of milkshakes depending on how much ass-gunk is loosened up inside the butt. These range from "Vanilla" (no poop particles, white coloring), to "Milk Chocolate" (light brown coloring), to "Dark Chocolate" (nearly black in color), and finally "Strawberry" (Done when a girl is on her period and doesn't want to take her tampon out to have vaginal sex and instead offers butt sex. To make one you must first make a Vanilla Milkshake and then rip out her tampon and stir it in. Best done as a surprise to the girl).