An extremely crusty caterpillar across someones forehead. Usually formed because the person decided/couldn't get pluckers. Most commonly said people with monobrows are named Marco. Also monobrows are sometimes flared up on the sides.
Man! That crusty kid over there needs to stop flarin' his monobrow!
by Crusty Monochode January 31, 2011
large hair above eyes. its when both eyebrows join toghether to form one giant hairy monster. i highly recommend waxing to anyone that suffers from this cruel hair growth.(also known as a mostache in the wrong place)
My mother waxed her monobrow causing great pain and discomfort every time she blinked.
by belly bottom man April 26, 2003