When it is late at night (around 3am) and your intoxicants have worn off, and you are just a shell wandering or staring aimlessly at walls, like a fish in a tank. Also, to actually fishtank you cannot be aware you are doing it -- that would mean you're coherent.
"We have to get Kevin home -- he's totally fishtanking."
by djdiem March 3, 2009
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a term used to initiate a physical connection between two people. usually used as a last resort when other person does not immediately respond to previous gestures. seems to be more prevalant when intoxicated or when at a party
a: did you know this house had a fishtank?
b: no i didn't, where is it?
a: oh its upstairs, come on i'll show you...
by smashley450 October 12, 2005
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A slang term for a woman's vagina. Typically used to describe someone who is dirty and promiscuous, therefore smelling of fish.
After last night, Kiley woke up and found some algae in her fishtank.
by ktmcq February 28, 2008
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one whom does not stop having sex with people; one who has had much semen(or skeet) pumped into there vagina or mouth... or butt
janelle is a fishtank, i mean shit even joey got some from her.
by marlaine May 24, 2004
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1. a group of loose women who are considered by all that view them to be the lowest sort of human being around

2. a girl with multiple std's
have you seen the fishtank?
unfortunately, ive got every std from aids to the herp
by icobobb crane October 27, 2005
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a term used when something upsetting happens; "just my luck"
When she lost the game, she said "aw fishtank!"
by hahajimmyinyourface August 17, 2010
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(verb) to bend a girl over a fish tank whilst delivering anal sex to her. Mid-motion remove the lid of the tank and repeatdley dip the girl's head in and out of the tank all the while still ramming the girl in the anus.
I got this girl round last night and fishtanked the shit out of her!!
by Smellyfinger85 July 23, 2010
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