eyeliner worn by guys who are normally dressed in a full-out emo or scene attire.
guys that wear eyeliner aren't always gay, which chavs and the likes seem to have a hard time understanding.
girl: omg did you see that guy that just walked by?
other girl: omg yess!!! he was wearing skinnies and guyliner!! so hott!!!
This is eyeliner worn by men, it could be any eyeliner.
This could mean the man is gay.
Guyliner can even be tattooed on the face(a woman can do this too).
Girl1: Do you see that guy? it looks like hes wearing makeup!
Girl2: Omg! It must be guyliner!
n. Periocular makeup worn by rockers, fluffy movie stars, brigands and other gentlemen with flair and a certain lack of torn rugby jerseys in their closets.