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1.
v. : to engage in sexual intercourse or other sexual activities in the bathroom.
Andrew: Dude, what was that girl and guy doing in the bathroom?
Leo: They were just cleaning the fish tank.
Henry: "Cleaning the fish tank"
by scoobydrew February 26, 2008
 
2.
A slang term for lesbians eating each other out.
What were u girls doing in there? Cleaning the fish tank.
by Slam Clown January 20, 2010