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1. massin
somone who is from the southshore massachuset. These people are faggets and can go fuck themselves. the word is a mix of martians and people from mass(massins).
most niggers from duxbury are massins.
2. massin
an abbreviation for the term masterbating
"dude i'll catch you later i'm massin"
can be used with a "t" replacing the "in"
i.e. "sorry man i have to go masst it"
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