Green’s Dictionary of Slang

(US drugs) a split match that is used as an improvised holder for the last fraction of a marijuana cigarette.

1969		R.R. Lingeman Drugs from A to Z (1970).
1981		D.E. Miller Bk of Jargon 342: jefferson airplane: A roach clip made of a split paper match; the roach is inserted in the V formed by the split.
2001		ONDCP Street Terms 12: Jefferson airplane — Used match cut in half to hold a partially smoked marijuana cigarette.