Ass onion 

A person that shits out a sphere shaped poo that makes you cry like an onion

'holy shit that is an ass onion you left there'

Ass onion by furiouswank May 5, 2007

onion ass 

n. an ass so nice it makes you want to cry; see also onion booty

Did you see the onion ass on that hottie? Damn!!!

onion ass by joe rockhead February 1, 2005

onion ass 

An ass SO amazing it brings a tear to you eye

Dude did you see that girl that works at Long Bottoms Coffee Co.? she has SUCH an onion ass that i cried the whole time i was in there!

onion ass by PersianDeity March 6, 2008

Ass Onions 

when attempting to penerate the anus of a lady friend or brokeback buddy, it is the crusty poo flakes that surround the enterance to said anus. As you thrust harder and harder past the many layers of the crusty poo flakes, they will cause a great discomfort that often results in an embarassing yelp, followed by a stream of tears.

Brad: oh man, last night i only got through half of Debra's ass onions before i had to pull out and wipe my tears in the bathroom.

Ass Onions by Dr. Richard Monroe April 2, 2007