butt-nasty 

A cross between the phrase "butt-ugly" and the word "nasty." In other words, it is the highest degree of nasty.

"That...is the most BUTT-NASTY FACE I have EVER seen."

butt-nasty by Darian Johnson May 22, 2006

butt nasty 

utterly disgusting; highly sickening.

Ex.#1:person #1: "Amy Whinehouse's teeth and hair are butt nasty."

person #2: "I know!"

Ex.#2:girl #1: OMG, last night during the slumber party, my BFFs,like, dared me to,like,wear mascara on my lips and wear leg warmers in public!

sister: OMG, ewwww, that is soooooo butt nasty!

Ex.#3: tween boy #1: did you see the picture on page 52 in our health book? you know, the detailed pic about...

tween boy #2: yeah, that was butt nasty...

ex. #4: ghetto guy #1: man, i was at this one pool party yesterday, and when i went into the pool i saw my girlfriend with a booger danglin' from her nostril!

ghetto guy #2: Man, dat is butt nasty!

butt nasty by codenamejester May 16, 2009

Butt nasty hot

A weather condition where it is so hot and humid that a layer of moisture forms in between your butt cheeks.

It is butt nasty hot outside.

Butt nasty hot by dtomasek March 23, 2011

kicked to the poo butt nasty 

adj. any pipe containing marijuana that has been compleatly smoked to the point that there is absolutly no chance of there possibly being another hit.

man, that bowl is kicked to the poo butt nasty.

kicked to the poo butt nasty by Hugonaut September 19, 2005

Nasty Butt Girls

A woman who has a nasty butt. Usually from being anally fucked to many times. Wide butt crack, jiggling all over the damn place, so lumpy, it looks like cottage cheese.

Yo, has anyone seen Paris Hilton's ass? She is such a nasty butt girl.

My mama call women who have jiggly butts nasty butt girls.

Nasty Butt Girls by Taswaysha February 8, 2007