Green’s Dictionary of Slang

1. (mainly US juv., also pipi) urination, urine; usu. in phrs. go pee-pee, make pee-pee [redup. pee n.¹ (2); euph. for piss n. (2)].

1898		Forbidden Fruit n.p.: The sound of that rushing stream electrified me [...] my little pego hardened of it's own accord, so jumping out of bed, I exclaimed: ‘Auntie, I must give you a last kiss, how funny the noise of your pee-pee has made me feel’.
1927		‘J.M. Hall’ Anecdota Americana I 175: Mabel asked her cousin to show her the toilet, so she could ‘go pee-pee’.
1934		H. Miller Tropic of Cancer (1963) 155: Having made peepee and blown his nose vigorously.
1944		E. Hemingway letter 13 Sept. in Baker Sel. Letters (1981) 570: He is like a little child who [...] wants the car to stop in the race so he can make pee-pee.
1953		R. Mais Hills Were Joyful Together (1966) 195: You look sick as a turkey pee-pee.
1961		T. Williams Night of the Iguana Act III: Is this true that you make pee-pee all over the suitcases of the ladies from Texas?
1964		H. Selby Jr Last Exit to Brooklyn 231: Helen put her thumb in her mouth [...] Have to go peepee Mommy.
1974		(con. 1945) E. Thompson Tattoo (1977) 397: I go make pee-pee.
1985		P. Auster City of Glass (1988) 17: They had to teach him everything [...] How to make caca and pipi in the toilet.
1987		R. Campbell Alice in La-La Land (1999) 32: The little twat might act like she thought a cock was for making pee-pee.
1998		J. Lansdale Rumble Tumble 41: That way there wouldn’t be underwear under the couch, or pee-pee on the bathroom floor.
1999		J. Poller Reach 100: Mummy go peepee.
2011		J.J. DeCeglie Drawing Dead [ebook] You beat his head in with a rock when he’s making pee-pee.
2015		J. Stahl OG Dad 230: She will bunch up some toilet paper and kind of air-wipe her tushy after going pee-pee.
2019		S.M. Jones Lives Laid Away [ebook] ‘They come out and make pee-pee on the street!’.

2. (mainly US juv., also peep, peepee meat) the penis.

1927		in G. Legman Limerick (1953) 14: There was a young dolly named Molly / Who thought that to frig was folly. / Said she, ‘Your pee-pee / Means nothing to me, / But I’ll do it just to be jolly’.
1965		Guild Dict. Homosexual Terms 34: peepee meat (n.): A small penis; a hangover from the nursery term meaning the urinary organ.
1969		‘Iceberg Slim’ Mama Black Widow 202: Your little ‘pee-pee’ will get hard at least once more.
1972		B. Rodgers Queens’ Vernacular 50: the penis [...] peep [...] peepee. [Ibid.] 52: fellator [...] peepee-puller. [Ibid.] 185: small penis [...] peepee meat (= child’s penis).
1974		D. Mamet Sexual Perversity in Chicago (1994) 74: Were you playing with each other’s genitals? Each other’s ... ‘pee-pees?’ ... whatever you call them at home.
1985		O. Hawkins Chili 37: My poor lil’ pee pee, its head scraped and bruised.
1998		P. McCabe Breakfast on Pluto 8: The morning he inserted his excitable pee-pee into the vagina of a woman.
2000		N. Barlay Crumple Zone 4: The Ridg has been trying to scratch his peepee which he cannot locate inside very baggy jeans.
2013		IOL Cape News 7 Oct. 🌐 I don’t support the cheating business but [to] cut someone[’s] pee-pee is something else.
2015		S. King Finders Keepers (2016) 369: Did she pinch your nose or twist your tiny useless peepee?

3. the vagina.

1967		‘Philip Barrows’ Whores, Queers & Others I [ebook] [T]he man has to put his pee-pee into the woman's pee-pee which is actually a hole in her body like your rectum.
1972		E. Grogan Ringolevio 200: He widened one of the little girls’ peepee enough to poke his large prick inside.

4. a male homosexual prostitute.

1979

Maledicta III:2 220: I always thought a ponce was a pimp and not a pee-pee, crack salesman, kid on the game, etc.