Green’s Dictionary of Slang

(US) a bus worker.

1960		J. Brosnan Long Season 266: Frank Robinson yelled to the driver, ‘What’s the matter, Bussy, you ashamed to be seen with us?’.
1967		J. Flaherty Chez Joey (1974) 55: Good-bye, bussie; good-bye bussie—we hate to see you go.
1974		P. Gent North Dallas Forty 203: The bus crawled [...] amid cries and insults directed at the driver. ‘Goddam, bussy!’ Jo Bob screamed.
1984		Jackson & Lupica Reggie 90: Hey, bussie, could...we [go] a little faster? [HDAS].
1984		Partridge DSUE (8th edn) 163/2: since ca. 1940.
1997		M. Cirino Name the Baby n.p.: My eyes meet the bus driver’s in that crazy long horizontal rearview. Did he just give me a dirty look? [...] Fuck you, bussie, shove your attitude, and stand on the motherfuckin’ gas and take me home.
2002		Honolulu Star-Bulletin 25 Aug. 🌐 I had known only one bus driver. David Mays [...] or ‘Bussie,’ for short.