Green’s Dictionary of Slang

1. (drugs) to use and be addicted to narcotic drugs; thus string-out n., the use of a narcotic drug.

1968		L. Wolf Voices from the Love Generation 49: That was my last string-out.
1979		‘Iceberg Slim’ Airtight Willie and Me 58: The nasal sludge in his voice was the tip off that he had strung himself out on his merchandise.
1994		M. Montague Dread Culture 171: Yuh no see di gal string out pon crack [...] she a snort di shit.
1998		I. Welsh Filth 84: All that posh he does still hasn’t strung him out.

2. (US campus) to suffer from some minor ailment.

1967–8

Baker et al. CUSS.

3. (US) to disturb, to upset or stess out someone.

2003

CameraObscura.ca Journal 4 Feb. 🌐 I’m feeling a lot of low level background stress these days. There’s a lot to do at work and I’m constantly on the go. [...] But when I get home I multitask three or four different things (laundry, downloading photos, blog writing, cooking) and string myself out even more.