Tankass 

A posterior so large, it is able to sustain the blow of an artillery shell.

Have you seen J-Lo's new video? Jesus christ she has got some kind of Tankass.

Tankass by Anonymous February 7, 2003

tankass 

An ass so huge that strikes back when you insult it.

Tara Bichard is a tankass!

tankass by Wes Morris September 17, 2003

tankass 

A generally unattractive rear end as a result of wideness.

Man, that girl went off to college and got tankass.

tankass by The S Diddy August 12, 2003

tankass 

Tom Crankshaw

holy shit tankass u need to warn sum1 when relesing gas from the ass! man......

tankass by Ali P March 17, 2004

Tankasaurus Rex 

A hybrid word made up of tank and tyrannasaurus rex, used to describe something with capabilities of both in the areas of strength and speed.

Ben: Whoa Clay just rolled that Viper over like 50 times! Your Ford GT is a Tankasaurus Rex!

Clay: Oh ya?

Tankasaurus Rex by shiftyclaybob September 16, 2009

tank ass 

an ass so large that if you tried to assram it your penis would not penetrate the rectum.

tank ass by sonny bono September 6, 2003

Tank Ass 

A fat angry man who has the same body composition of, and design as an M1A1 Abrams battle tank. Except without workable treads. Has sat on the same pillow for the past ten years, contact will cause pink eye.

Spends his time eating mostly TV dinners and small children.

Josh Fien is a Tank Ass.

Tank Ass by The Truth Hurts Fien February 12, 2010