It’s hilarious and native speakers will LOVE it if they hear you use it. The first part of the word “uni” means “one”. For example, a “unicycle” means “one wheel” and a “bicycle” means “2 wheels”. (bi means two)
Secondly, “brow” is short for “eyebrow”. A person’s “eyebrow” is the hair above each eye. Most people have 2 eyebrows. So now… Imagine a really hairy person.