Green’s Dictionary of Slang

boss adv.

[boss adj.]

(US) splendidly, excellently, perfectly.

[US]‘Iceberg Slim’ Airtight Willie and Me 14: She boss cute enough for that four hundred dollars you want to spend?
[US]‘Dr Dre¹ ‘Housewife’ 🎵 The hoe started callin when I started boss ballin.