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1.
the act of squeezing ones cock and balls into the recipients 'rusty bullethole'. it is as hard as trying to keep a dog in a bath.
"that bird last night was filthy as fuck, i gave her the dog in a bath.
by paddy farrell September 26, 2004
 
2.
during some mad fucking, grabbing your testicles as if you are going to Brain (definition #5) someone then, inserting them into the vagina or asshole. It is very difficult to do, hence the Dog in a bath name.
her pussy looked tight so i thought id try to put the dog in a bath.
by Skeet Inc. July 24, 2006