Definitions by LewDaMan

asslusion 

An illusion of ass. When a girl's clothing makes it appear like she has a nice ass, but in reality there is nothing there.

also applicable to men

"Damn that girl got a fine booty!"
"Nah man, she flat. Them jeans just be givin her an asslusion."

asslusion by LewDaMan October 9, 2016