cleaning the fish tank 

A slang term for lesbians eating each other out.

What were u girls doing in there? Cleaning the fish tank.

cleaning the fish tank by Slam Clown January 20, 2010

cleaning the fish tank 

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"

cleaning the fish tank by scoobydrew February 26, 2008

Cleaning out the fish-tank 

A particularly large dose of man fat applied liberally to the inside of a woman's beef curtains. Ideally needs to be enough for a fair amount of drippage

Jon : Why didnt you answer your phone last night?

Ad : Mate! I was cleaning out the fish-tank

Jon : but i phoned back an hour later

Ad : Bow chicka wow wow

Cleaning out the fish-tank by ExcellCRW November 27, 2011