What is ATM?

Ass to Mouth. Usually, part of threesome sex, where man is fucking one girl in the ass, and instantly after removal of the penis from the anal hole, the dick is inserted inside another girl’s mouth. Often done by a single girl with her toys when she is inserting the dildo in her ass and then tasting it with her mouth. Also used in classic couple sex when the anal sex is followed by a blowjob.