When someone who is skateboarding or running does not notice a pane of glass and collides with it.
“How‘d you break your nose?”

I didn‘t see the glass door when I ran inside and I totally pulled a Fish Tank."
by Tall Jesus April 5, 2011
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ok think about a fish tank four sides so you need four people 2 girls and 2 guys make the guys face the girls and then they have sex standing up so they make a two lines next to each other like the equels sign. now there are sides air between the people are the sides and a bottom!
man: lets fish tank all night
lady: but we need more people
man: get your roomate i 'll get mine
lady: ok

and they fish tank alllll nite long and moan

I like the wayyy u fish tank baby
by karlee furlicker July 27, 2009
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A tank that is full of fish that u plug in and they become super Neilified.
"The fish tank is on!"
by Jenny February 5, 2005
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When a female gets oral sex while taking a dump in the upper tank of a toilet.

It’s like a female blumpkin mixed with an upper decker.
Sara gave me a blumpkin last week. I returned the favor by hooking her up with a dirty fish tank in the restroom at the mall.
by Ann_Archy September 12, 2018
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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
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