To wear your hair in a manner similar to Doug Gabriel, formerly of Oakland Raiders. i.e. a hairstyle similar to that worn by the Predator; a corn row mullet
Pre-dating is the period of time before a couple becomes official. It often includes a significant amount of hanging out, flirting, and often times arouses suspicion amongst friends of either or both parties. Also see talking.
Friend #1: You and John have beenhanging out alot lately, are you guys dating???
Friend #2: No, we're pre-dating.