Green’s Dictionary of Slang

(US tramp) a cigarette made from the remains of extinguished cigarettes dropped in the gutter.

1926		N. Klein ‘Hobo Lingo’ in AS I:12 650: Curbstones — cigar or cigaret ends.
1931		Irwin Amer. Tramp and Und. Sl. 58: Curbstones. – Cigar and cigarette ends picked up on the street or in the gutter.
1960, 1975		Wentworth & Flexner DAS.