Green’s Dictionary of Slang

1. a masturbator, esp. one who frequents striptease shows or similar.

1941		‘Gypsy Rose Lee’ G-String 64: Soon as the jerkers think we’re cleaning up the show, business takes a dive.
1972		(con. c.1930) G. Sothern Georgia 280: ‘When you’re with me, you wear my flowers,’ he ordered, ‘not some jerker’s from New York!’ .
1988		H. Max Gay (S)language.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Heavy jerker. Someone who masturbates on and on.
2001		SX (Sydney) 7 June 34/4: [A] steamy hot-tub jerkoff scene, where the beauty of the jerker is only overshadowed by the sight of his cock bobbing up and down [Simes:DLSS].

2. (US black) in fig. use, one who talks nonsense.

1992

R.C. Cruz Straight Outta Compton 39: ‘You’re a shit-talker,’ she said. ‘A jerker.’.