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1.
A group of highly intelligent people getting their orgy on. Typically a bi-sexual swingers party where nobody has an IQ less than 120.
Dude #1: "Were you at the fucktank last night?"
Dude #2: "Yeah, that hot geeky chick kept mumbling about alternative fuels through the bukkake."
by Charles M. Slutz March 11, 2014
 
2.
Fuck Tank n.
1.- A tank with a penis replacing it's gun barrel.

2.- Anyone I disagree with
Shut the fuck up fucktank
by Ax December 09, 2003