Skinheads and people with skin hair cuts who understand a buoyancy of life well enough to know the ultimate fundamental of any existence since weight is burden that has been overcome. The reference is derived from a whooty, her ass cheeks, which half of it looks exactly like the back of a skinheads head and someone with a skin hair cut.
Example 1: Than man is so straight, he an heterosexual everyone calls him a half ass cheek.
Example 2: Lucifer solved the problem in minutes today in class, the lecture teaching the class "she called him a half ass cheek".
Working hard for something, that usually shouldn't be that hard or is overcomplicated.
Guy1: I fucking hate biology class, I be working ass and cheek every damn day I'm there, and the teacher barely does her part. She didn't even read the questions.
Guy2: Yeah, I got 6 questions done when she told us that we should be finished, and I was working faster than most people.