Noun, An incredibly attractiveman who will become excited just to be excited. however weird this may make him seem, however, he is sexy enough to make up for being borderline insane.
Girl 1: Like, OMG Hadyn's being SO Weird! Like, why is he so happy?
Girl 2: Who cares? Just look at him! He's such a Yayman!
Girl 1: Yeah, you're right, he's damn sexy!