look up any word, like swoll:
 
1.
bum hair is the hair in your bum crack! that is very annoying!
why are you shoving your bum hair in my face?
by blubber the bloody nut April 10, 2009
 
2.
A cooler way of saying bummer.
Aw bumhair, my dildo broke.
by bondxxxmage August 19, 2008