An Arse-fro is the unsightly hair just above the arse crack, can be found in both males and on rare occasions females. can come in various shapes, density and colour. arsefro is never usualy atractive, quite nasty really.
*fat hairy dude bent over*
guy 1: eerrr dude, that guy needs to sort his arse-fro out.
guy 2: defo man, its just wrong