Put 'em in a casket, like the Taker
21-and-0 on you haters, 21 Os
Referring to the wrestler The Undertaker. The Undertaker is an American professional wrestler signed to WWE. The Undertaker is also connected with various specialty matches, including the Casket match.
21-0 refers to The Undertakers unrivaled record of being undefeated at WrestleMania, WWE’s premier pay-per-view event, winning 21 consecutive matches at Wrestlemania without a single loss.
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