Green’s Dictionary of Slang

blow job n.1

also blow, blowie
[blow v.2 (1c) + job n.2 (2)]
(orig. US)

1. [1940s+] (also job) fellatio.

2. [1990s+] (US black) cunnilingus.

In compounds

blow-job artist (n.) [-artist sfx]

[1960s+] a fellator or fellatrix.

In phrases

give someone a blow job (v.)

[1960s] (US campus) in fig. use, to toady to.