Top Definition
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."
by Darian Johnson May 15, 2006

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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!
by codenamejester May 16, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt