Top Definition
Short for "masturbation material"
- After getting critically erected in puplic, I realized that Britney Spears' new vid was "masturbation material"

or

- Online n00b #1: "check out some of the first episodes of baywatch, just click on the link, it's sweet mas mat, dude."

Online n00b #2: 2thx, I'll check after I've finished facebooking"
by vulvasker August 06, 2010

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