Referring to a man with long (often blond) hair. Seen from behind, he may resemble a 'she'. Moer means to beat up, steek means to fuck. So from behind you want to steek him but from the front you want to moer him. In Afrikaans: "Van agter af wou ek hom steek, maar van vooraf wou ek hom moer". Roughly equivalent to manvrou.
Jesus, I thought that was a fuckin cherry but it was a moersteek!!