1929, "drunk," past-participle adjective from piss (v.). From 1946 as "angry," from piss off.
Entries linking to pissed
piss v.
"to urinate, discharge the fluid secreted by the kidneys and stored in the urinary bladder," c. 1300, pissen, from Old French pissier "urinate" (12c.), from Vulgar Latin *pissiare, of imitative origin. To piss away (money, etc.) is from 1948. Related: Pissed; pissing. Pissing while (1550s) once meant "a short time."
He shall not piss my money against the wall; he shall not have my money to spend in liquor. [Grose, "Classical Dictionary of the Vulgar Tongue," 3rd edition, 1796]
To piss money on the walls "throw money around recklessly" is attested from 1540s.
He who once a good name gets,
May piss a bed, and say he sweats.
["Dictionary of Buckish Slang, University Wit and Pickpocket Eloquence," London, 1811]
piss off v.
1958, intransitive, "go away," chiefly British; the transitive meaning "annoy (someone)" is by 1968, chiefly U.S.; from piss (v.) + off (adv.). Pissed off "angry, fed up" is attested by 1946 (Partridge says 1937); said to have been used in the military in World War II; in common use from 1970s.