look up any word, like blumpkin:
 
1.
The unsightly double-layered rear end first seen on BMW's E65/66 (2002-08) 7 Series (penned by controversial design chief Chris Bangle) and soon spread throughout BMW's range and the automotive industry. Reviled by BMW purists, the Bangle butt was summarily dropped following Bangle's departure and the release of the new model range starting with the F01/02 (2009- ) 7 Series.

Closely associated with the verb bangle, the Bangle butt invites the opposite reaction of DAT ASS.
Bill's new ///M6 is pretty sweet, but the Bangle butt ruins the look...it may be fast but it looks like a whale
by beckenbauer June 14, 2011