legs that spread easily, often referring to a whore of some kind
Dude 1: Dude, did you see that girl?
Dude 2: Yea.
Dude 1: Yea I heard she sleeps around.
Dude 2: Oh, so she has mayo legs?
Dude 1: Mayo Legs???
Dude 2: Yea, her legs spread easily.
Dude 1: Yea... maybe you have a chance then.