1788, "to spray with urine" (trans.), euphemistic abbreviation of piss. Meaning "to urinate" is from 1879. Related: Peed; peeing. Noun meaning "act of urination" is attested by 1902; as "urine" by 1961. Reduplicated form pee-pee is attested by 1923.
he took a pee
pedophile
pedophilia
pedophiliac
pedophilic
peduncle
pee
peek
peekaboo
peel
peeler
peen