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An incredibly unlikely thing that has happened.
From the expression "that'll happen when monkeys fly out my ass"; if that things has happened, it could rightly be called an assmonkey. You could also call it a "flying assmonkey" to distinguish it if you had to.
assmonkey by herculaneum November 23, 2006
A monkey with an obscenely large ass, so large that its head actually goes up its ass.

You can buy them in places that are infested with assmonkeys, such as, the white house. "bo-de-gas", nigga
"hey is that derek?"

"yeah, hes a fuckin assmonkey"

"who cares"
assmonkey by r0fl December 11, 2007
A gigantic monkey with one asscrack running down its face.
canadianslook like sideways assmonkeys.Also, Eric
assmonkey by NickTheBitch December 10, 2004
Legendary computer gamer with no homosexual tendencies whatsoever. Assmonkey is said to be invincible and is feared like no other in the computer gaming world.
Oh hell, Assmonkey is playing! Lets go play battlefield instead.
assmonkey by Bob~N~Donnie December 13, 2008
A man who either appears to be gay, or is pissing you off so much you think he is homosexual in nature.
Step off my koolaid you assmonkey, this is my bitch.
assmonkey by Mattmangold469 March 3, 2004
A person who is hyper, by nature, much like a monkey and usually enjoys making an ass out of themselves for the enjoyment of others.
That girl was so drunk at the party, she acted like an assmonkey when she danced on the table with her shirt tied around her head.
assmonkey by Lesberita June 24, 2008