Alpha Male Other Guy
The guy that steals the attention of the girl(s) you are talking to at a place, party, bar, club. etc.
"....Then she smiles, introduces herself to me, offers her hand and that very moment this guy sits next to her. Asks her if the seat is available, says something funny (I didn't hear what but she laughed), pays zero attention to me and now she sort of turns to him. I couldn't hear what they were talking but after the class she says to me "See ya!" and goes with this guy to a cafe accross the street."