beau-nasty 

A slovenly fop; one finely dressed, but dirty. This term's also used to refer to mobsters, who appear nice on the surface, but are nasty thugs underneath.

Sure, the capo's son dresses nice, but he's a beau-nasty brute underneath that suit...

beau-nasty by Erin Montgomery May 2, 2010

beaunasty 

Someone who doesn't shower or keep their body clean, but dresses nice to try and cover it up. Or it can be calling someone a nasty boy.

Anna is such a beaunasty.

beaunasty by abby j jamie March 13, 2007