A female (usually unattractive, or socially "defective") that stays with her more attractive friend at a party and "looks after" her friend, or just sometimes gets in the way of her friend socially. Often times a young (not necessarily) male would be after the friend.
Male #1: D'you see Jenny las nigh'?
Male #2: Yea, D'you see tha cock-blocker she was with?
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