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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
 
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