Duel mohaws that run from the front to the back of your head sid by side. It looks like the characteristic spines that run up Godzillas back and neck to the top of the head.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!