After anal sex when the man has excremental staining to the head of his penis he is said to have a dirt turnip.

In simple terms, when you pull your root out of a mud butt you get a dirt turnip.
Tom couldn't help but admire his dirt turnip when he was done.

Wife: What would you like me to make for dinner?

Husband: dirt turnip
by Garage gang February 25, 2017
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