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1.
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
 
2.
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