You throw a shot at me, I'm throwing a shot back
Yours is on a joint, mine's whistling by your top hat

from Joe Budden (Ft. Crooked I, Joell Ortiz, Nino Bless & Royce Da 5'9") – Slaughterhouse Lyrics on Rap Genius

Meaning

Basically you throw a diss (shot) at him in a song, he’s taking a shot at you with a gun.

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