A) A girl that knows that a good time does not have to end in your bed.
B) Somebody that is spontaneous and friendly to everybody causing weak guys to be under the false and desperate impression that she wants more than friendship.
Mike: She totally wants you dude!
Tom: Hey baby want to go back to my place for coffee?
Girl: Fuck off creep!
Mike: What a cock tease!
Cock teases are typically thought to be the minions of a larger, more evil force.
Stupid Sucker: "I spent 50 bucks on that cock tease and she won't even return my calls."
2.(v.)To purposely become enticing to a male to the point of giving him a hardon, or in most cruel cases, blue balls, with no intention of follow through; to lead a man on.
2."Dude, this girl totally cockteased me just now. I had to pour ice down my pants."