A Synister Weasel is promiscuous female, one who may deceptively act innocent whilst cheating on her man.
"Yo, just brapped out some guy in Gedzville tossing ma' girls salad!"
"man, that gash is a synister weasel, bre!"
"man, that gash is a synister weasel, bre!"
by MC Scratch January 1, 2009
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