Green’s Dictionary of Slang

rip off v.

[SE rip off, to tear off]

1. [1910s] (US) to create, to make.

2. [1960s] to take, to secure (with no implication of theft).

3. [1960s+] (US black) to have sexual intercourse.

4. [1960s+] (US black/prison) to rape.

5. [1960s+] to steal (from).

6. [1960s+] (orig. US, also rip) to cheat, to defraud, esp. in drug deals.

7. [1970s+] to raid; cite 2010 refers to on-street confiscation.

8. [1970s+] to kill, to assassinate.

9. [1970s+] to satirize.

10. [1970s+] to copy, to plagiarize.

11. [1970s+] to exploit financially.

12. [1980s+] (US black) usu. of whites, to exploit, socially or economically, to place at a disadvantage.

In compounds

rip-off artist (n.) (also rip-off merchant) [artist n. (1)/merchant n. (1)] [1960s+]

1. a thief.

2. any form of cheat, emotional as well as material.

In phrases

rip off a piece (v.) (also rip off a hunk) [SE rip off/sense 3 + piece n. (6)]

[1930s+] (US) to seduce, to have sexual intercourse.