What does blow job mean?

blow job meaning in Etymology Dictionary

also blowjob, 1961, from blow + job. Precisely which blow is meant is the subject of some discussion; the word might have started as a euphemism for suck (thus from blow (v.1)), or it may relate to the volatile climax of a climax (therefore blow (v.2)). Unlike much intercourse slang, its time of beginning probably is pretty near the day it initially is attested in publications: since recently due to the fact early 1950s, armed forces pilots could innocently talk of these jet airplanes as blow tasks based on the "Thesaurus of United states Slang." Compare blow (v.1).