Verb: The act of masturbating (typically to orgasm) while in the shower/bathtub. Can refer to solitary masturbation, with assistance, or acts of voyeurism.
Solo: I had the most amazing bathrub this morning. I must have cum like three times!

Assist: My girlfriend gave me a great bathrub this morning. Totally helped my morning wood.

Voyeur: I bathrubbed while watching Naomi shower. She didn't notice I was doing it while showering right next to her.
by Iris Scavo March 07, 2011

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