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1.
From the Greek Term: Dogamus Bathamus

When a guy sticks his balls in a girls ass.
They are as hard to keep in there as dogs in a bathtub
by Lisa K April 16, 2004
 
2.
When a man fucks a womans pussy with his balls in her ass.
Bitch, you ever heard of dogs in a bathtub?
by Five Seven February 06, 2008