A rear end that is exceptionally attractive, well-defined, or desirable according to the butt fad of the month.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.

A small but really nice ass

It's really curvy and you just have lust for it.

Or when a girl just wears really tight skinny jeans that you can see her asscrack through them.

A cheap person or a over cautious person. Tight taken from 'Uptight'.

Someone who treats others ideas and opinions with scrutiny or sees the world in an extremely cynical and sarcastic view.

someone who is reluctant to spend money when they have no reason not too

combination of tight taken from uptight and ass taken from asshole. A tight ass is someone who could be uptight in a negative way.