Green’s Dictionary of Slang

1. (US black) a trickster, a deceiver, a flatterer, an insincere person.

1928		R. Fisher Walls Of Jericho 78: Accordingly his fellows declared him to be a ‘jiver from way back’.
1935		(con. late 1920s) L. Hughes Little Ham Act II: That little jiver don’t own nothing.
1940		‘Digg Mee’ ‘Observation Post’ in N.Y. Age 30 Nov. 10/5: [I] lingered a while on the jiver’s part, but never took [a] chick to my heart.
1968		‘Hy Lit’ Hy Lit’s Unbelievable Dict. of Hip Words 4: big conniver, you ain’t nothing but a jiver – Letting someone know that you are hip to his carpetbaggin’, Casanova game.
1970		A. Young Snakes (1971) 56: Naw, you can’t jive the jiver, I ain’t goin for that.

2. (also jivester) a jazz fan.

1946		S. Jackson Indiscreet Guide to Soho 48: Dozens of young ‘jivers,’ average age 18, make a bee-line for the sax shop. [...] With them ‘hot’ jazz is an obsession.
1981		(con. 1940s) O’Day & Eells High Times Hard Times 123: A bunch of jivesters had crowded in [...] determined to get their money’s worth.
1999		(con. 1958) C. Logue Prince Charming 231: Among the enjoyable consequences of the march was the huffing and puffing of its opponents. ‘Jivers ... babies in prams ...Communist dupes ...’.

3. a rock musician.

1971

L. Bangs in Psychotic Reactions (1988) 9: I got back into those junior jiver Yardbirds imitations in a big way.