Top definition
A human buttocks whose properties are such that it can not be described with any normal human though processes. Typically, used when just using the word "ass" just won't suffice.
"I am going to go back in to that bar and kick some non-euclidean ass" said Erik.

As she entered the room someone shouted "Look at that piece of non-euclidean ass!"
by a wayward s0n October 17, 2011
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