Match, and if you think I'm playin'
In sports a match is something two teams (or two individual opponents depending on the sport) will compete in and play. Game, Set and Match refers to the completion of a match (in tennis) so Lupe is announcing the end of this game and, possibly, himself as the winner.
The end of a match could occur in Cricket if the 10th wicket is from a fielder catching a ball hit by a batsman.
Children are usually told by their parents not to play with matches. Lupe is advising his opponents not to play with fire.
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