To be fucked up the ass for so long, that the mucus in your ass starts to foam and leak out. See also anal fluid
Jane - "Oh baby, your cock is so tight in my ass, I think I could fucking explode"
Bill - "It looks so good too, baby. Your foaming at the ass!"
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Foam ass is used to describe a female bum in a positive way. It was invented by Jonny Foam Ass.
Look at that foam ass Cameron!
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when a guy/girl has an extraordinarily soft behind.
Eric: Broooo, Cbass has that memory foam ass!
Cbass: ?!?!
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