A lady's ass that is so flat and wide that it resembles a tank like structure. If she layed down you can use that tank ass for a table.
by gerbil April 17, 2003

While not human a good example would be a machine called a terminator from the Terminator movie series. how the machine takes damage and continues moving forward. An example of a human tank ,if you want to see humans who are like this go watch any mainstream anime. Ex (bleach, naruto, DBZ, fairy tail, one piece)
by Kyle crow September 19, 2016

guy number 1- "dude, lets go to that party tonight"
guy number 2- "no way, theres gunan be to many tank wankers there"
guy number 2- "no way, theres gunan be to many tank wankers there"
by yo mamma November 22, 2002

by SpacerMike July 23, 2016

When you fill up your car with gas specifically to take a long drive to hook up with someone. To buy gas for a booty call.
She spent $32 to fill up her car so she can have a full booty tank so she could drive from Ft. Worth to Austin to hook up with him for a booty call.
by Teasie May 2, 2013

by Russian Surprise October 31, 2014

by Evanster November 19, 2005
