Green’s Dictionary of Slang

(US campus) money.

1973		Eble Campus Sl. Mar. 2: jing – money.
1976		(con. 1969) C.R. Anderson Grunts 29: Got any jing?
1991		D. Jenkins You Gotta Play Hurt 263: ‘But, oh, bubba, the money.’ ‘Tubular,’ Shag Monti said. ‘Go for the jing, man’ .
1996		Eble Sl. and Sociability 40: Other echoic forms from college slang are jing ‘money’ (from jingle) and ssssss – a hissing sound to indicate that an airhead ‘someone who lacks common sense’ is emitting the contents of his or her brain, air.
2003		(con. 1968) J. Corbett West Dickens Avenue (2004) 145: If you want to borrow money from another soldier, you ask, ‘How you fixed for jing?’.