When a woman regularly shaves her pubic hair in the Spring/Summer/Fall, but lets it grow back in the Winter, leaving a 5'o'clocktwat shadow growing back. A prickly bush.
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!