1. - noun: A wig that one wears in the pubic region if you:
a) haven't grown pubes yet
b) shaved/burnt/waxed them off accidentally
It is considered a poor replacement for actual pubes.
2. noun - A complete dickface
Oh my god, your pubes got burnt off in that house fire? Dude, get yourself a cock wig, I heard they are made from real pubes these days.
I'm nineteen and I still don't have pubes, maybe I should buy a cock wig, I'll look well cool!!
Mono is a complete cock wig.