Green’s Dictionary of Slang

1. (US black/campus) of a woman, having an attractive figure.

1967		Current Sl. I:4 2/1: Jock, adj. Having a good figure (applies to females).
1971		R.D. Pharr S.R.O. (1998) 109: ‘You’re a fox with a jock shape’.

2. (US) athletic, sporty.

1969		Atlantic Monthly July 108: Michael Meyer as Brenda’s jock brother, a big, gregarious, simple-minded, good-hearted lug who has exactly the right moves of the athlete.
1977		J. Langone Life at the Bottom 199: We went around cuttin’ all these jock shots out of muscle mags.
1985		E. Leonard Glitz 260: She told him about Tommy’s drinking, his macho jock attitude.
2005		E. White My Lives 234: Goddam faggot, you like paying for this hot jock dick.
2014		A. Fox-Lerner ‘Traces of a Name’ in ThugLit Mar. [ebook] [S]ome big-ass jock douchebags [...] ex-football player meatheads.