Top Definition
The term applies to "dry-humping" the bathtub floor in the middle of having a bath. This may be performed with the use of a sex toy; something that may be mounted on the bathtub floor with which the penis may be inserted into.
The decrease in friction results in no chafing after easily having an orgasm in the water.
That fucking chick wouldn't suck my dick so I told her to put on a movie while I went bathtub humping.
by Sza BOMB May 26, 2009
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