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When you go down on a girl and she still full from the guy before
I just went down on this chick but she was bathtubbing

Fill her up like a bathtub
by Onacid1990 June 16, 2018
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The act of drinking someone else's used bath tub water. Especially after a gross encounter.
"Dude I just went bathtubbing in my neighbor's house! It tasted great!"
by BlackZoidberg July 04, 2017
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