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1.
One who invades the ass and/or is a complete douche bag
Guy 1: Hey man wanna see my pokemon cards!!

Guy 2: Get the fuck away from me you ass banshee!
by The Zach Daddie April 09, 2006
 
2.
One who annoys you usually by invading your space to scream or yell at your ass.

Also can be used as a term to describe the general douchery of an annoying person.
Stop being an ass banshee or get the hell outta here!
by S-e-a-n July 15, 2006