An extremelycrusty 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.
The monobrow originates in India and got brought over to England by Jack Coles. He thinks he looks good but that monobrow is revolting, he ends up looking like a btec Bigfoot. Like the Wiseman Marcus Miola once said "he needs to get a razor and cut straight down the middle. If we ever worked out how to open our third eye Jack's would be covered in a musk of hair, Tramp.
This nigga be looking like Bert from Bert and Ernie