Green’s Dictionary of Slang

(US black) a ritual insult.

1924		W.C. Handy ‘Gouge of Armour Avenue’ 🎵 For though she slipped him in the dozen only this from him I heard: ‘Oh, oh, Baby, Hold your tongue’.
1980		E. Folb Runnin’ Down Some Lines 12: I would run down the latest ‘dozen’.