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...
door Erin Montgomery 1 mei 2010
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.
door abby j jamie 12 maart 2007