“Ugly Friend” (noun):
the friend of the hot girl who is never chosen first. She is always left alone and is very angry about it. When given the choice between the 2 the guys always chose the prettier friend and leave the ugly big nosed one out of the cold.You literally have to beg guys to touch the girl to give her a pity screw.
Example: Sara is a real ugly friend.
Sources: STLDrunks.com and Urban Dictionary