Top Definition
when one of your buddies ditches you all day for his girlfriend, and hangs out with her at cupcake stores and what not.
"hey, is stan coming out to watch the canucks tonight? nah...he's being a total sin bag"
by freneticmalestrom May 29, 2012
An ugly woman, one that you only would hook up with if you are drunk, high, or really really horny.
Chris: Yo, did you hear he took that sinbag to the shed last weekend?

Michael: Amen, he ran a train on my bed. True roadie.
by TruRoadE March 10, 2008

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