Green’s Dictionary of Slang

1. (drugs) to inject drugs; thus jabbing n.

1905		S.F. Call 11 Apr. 9/5: The professor stole up behind and jabbed a hypodermic syringe into one youth’s wrist.
1908		K. McGaffey Sorrows of a Show Girl Ch. xi: It is my personal opinion that she sniffs the white. She either does that or jabs, though it don’t show on her arm.
1917		NY Tribune 13 July 7/7: he offered her cocaine and then attempted to jab the hypodermic needle into her arm.
1938		D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 104/1: To jab. To take drugs hypodermically.
1951		in Whitman Women’s Home Companion June in Hamilton Men of the Und. 214: But with all that jabbing I didn’t even get high any more.
1953		F. Paley Rumble on the Docks (1955) 57: All those guys use junk [...] every guy’s jabbin’ himself.
1975		E. Torres Carlito’s Way 74: Jab himself in the cock and in the neck.
2001		ONDCP Street Terms 12: Jab/job — To inject a drug.
2001		D. Looser Boobslang [U. Canterbury D.Phil. thesis] 94/1: jab v. 2 to inject drugs.

2. (US campus) of a man, to have sexual intercourse.

1966		Trimble 5000 Adult Sex Words and Phrases.
1989		P. Munro Sl. U.