A combination of someone being known as a piece of shit or a assclown, but add in being either arrested or doing something despicable.
1. Chris Brown went from being just a Turd to a ThugTurd when he beat up Riyanna.

2. Mel Gibson was just a Turd for his boozing until he gained world-class ThugTurd status for his anti-semetic statements and fathering a child with his mistress.
by SouthernJet January 29, 2010
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