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1. trash dick
(adj.)- A promiscuous male.

This is a man who'll put his dick in any and all types of pussy. He sleeps around excessively with many different females and probably has suffered from at least 1 STD in his life....therefore, making his dick "trash". The cool term for this is playa but to females a trash dick is just a triflin slutty man.
"Girl, that's why I don't date entertainers or athletes--because most of them ain't nothin but trash dick."

She broke up with her man because she found out what a trash dick he is.
2. Trash Dick
A term commonly used by soldiers in the US Army for when some thing doesn't meet the standards or is in disarray.
Drill Sergeant- "Privates this barracks looks like straight up trash dick, FRONT LEANING REST POSITION MOVE!"
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