1. [late 17C–early 19C; 1960s+] to have sexual intercourse.
2. [1960s+] (US) to engage in athletics.
3. [1970s] to be lively and have a good time.
4. [1980s+] (US black) to imitate, to irritate (cf. on someone’s jock(strap) under jock n.1 ).
5. [1980s+] (US black teen) to idolize, to pay someone lots of attention, trying to impress them.
[2000s] (US black) to imitate.