Green’s Dictionary of Slang

the female breasts; also attrib.

1708		N. Ward Adam and Eve 78: She nothing has to boast, Besides her Tongue and Udder.
1712		N. Ward Poetical Entertainer II 13: Her Udders no Cow newly calv’d could have bigger.
1725		N. Ward Amorous Bugbears 21: Some, in the zenith of their Strength and Health [...] Among the Crowd steal hither to refresh / Their wanton Appetites with younger Flesh, / That they the pleasing difference may tast, / ’Twixt Parchment-Udders and a tender Breast.
1760		B. Weatherby Great News from Hell 43: Her protuberant Udders, which were blown up to the best Advantage [...] looked like two Bladders-full of Scotch Snuff.
1933		D. Thomas letter Nov. in Sel. Letters (1966) 53: Farmers’ boys pressed amorously upon the udders of their dairymaids .
1942		‘Lagos Lagoon’ in M. Page Kiss Me Goodnight, Sgt.-Major (1973) 55: One night they went out to the native hot spots, / Pinching black udders and feeling black twats.
1970		in P.R. Runkel Law Unto Themselves 165: I started kissin’ her udder [...] Her titts.
1988		J. McDonald Dict. of Obscenity etc.
2000		Saroig ‘Getting Drunk with Aunt Marrie’s Nectar’ on Nifty Erotic Stories Archive 🌐 Her tits were uncovered now... the two girls watching the two heavy mammoth udders with love and passion.
2005		Roger’s Profanisaurus in Viz Apr. 49: udder pants n. A bra.
2017		T. Spicer Good Girl Stripped Bare 18: ‘Wow, check out the udders on that one!’.