Someone who backstabs you and as a result becomes a piece of shit or the lowest of the low.
Scumsnake can be used seriously or jokingly.
1. Girl 1: You told me you were never going to tell Dan.

Girl 2: So what. Who cares he knows you fucked Larry.

Girl 1: You scumsnake! I just wanna spit on you right now.
2. You're really a scumsnake for that.
3. That's a scumsnake move.
by Young Ale December 15, 2017
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