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to touch yourself....it is the poor man's term for masturbating.
"Hey Alana, what is your hand doing under the pillow?"

"Well, I was just trying to keep ma hands warm, but your mbating is making me uncomfortable."
by M-Dawwwg January 13, 2012
This is slang for masturbating, the short way of saying it. Also the less embarrassing way of saying masturbating when speaking around adults and strangers.
ex. I caught him m.bating two times!
ex. I really enjoy a m.bating in the afternoon.
by rando September 30, 2005