The act of squashing a friend or random victim, through the same means as a pile on, against the floor or fence so when the person tries to say "i can't breathe" it sounds like "Corn Beef".
During break time at school in the tennis courts you and your friends pick on your victim and rush them, squashing them against the fence. As they try to inform you that they "can't breathe" it comes out as "corn beef". Therefore resulting in the "corn beefing" being completed
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