Green’s Dictionary of Slang

1. (US) a Marlboro cigarette.

1991		D. Gaines Teenage Wasteland 225: Chain smoke ’boros and soak up the life force, music.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 68: He struck a match, lit a ’Boro.
2001		G. Pelecanos Right As Rain 46: He slipped a deck of Marlboro reds into his shirt pocket and watched his son take his own pack of ’Boros off the bar and do the same.

2. Middlesborough, North Yorkshire, UK.

2007

R. Milward Apples (2023) 75: It was a macho thing in Boro to say, ‘Would’ve nailed her, fucking dirty slag’.