An ass so narrow and skinny it resembles the threaded end of a needle. Characterized by the complete absence of butt cheeks, said persons bunghole looks like a cats with their tail up and makes only slight whistle noises when farting.

Can be caused by Noacetol overdoses, noassatall disease, or having a diet consisting solely of pizza bites and mountain dew. Deliberate needle ass conditions can be brought on by the Crack-ho-skinny diet.
Brooke's needle ass made it look like she had a camel toe in the back.
by John Wesley February 12, 2008

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