Green’s Dictionary of Slang

an act of cunnilingus.

[1674		Hogan-Moganides 38: Not so, quoth Nurs, you may discharge Your Argument, you are too large, But cause as Learned Doctors Teach, The touch-hole is so near the Breech. And is not that the very cause, Good Gammer Haunch, to come more close, That Ship and Bark, Sea-Coach, and Car, [...] By Epethite of Female Gender, That to her Port-holes, and her Tuns, She beareth Lading, Men and Guns?].
1841		Flash (NY) 17 Oct. n.p.: The damsel asked him what he wanted. Flushed and eager, he abruptly answered [...] ‘a g— ’ which means something not fit to eat .
1870		Cythera’s Hymnal 46: And when the gamahuche is done, / There are pleasures still not yet begun.
1879		‘Sub-Umbra, or Sport among the She-Noodles’ in Pearl 5 Nov. 4: How my tongue searched out her fine stiff clitoris, [...] I sucked it in ecstasy, and titillated her sensitive organs so that she spent profusely in a minute or two, holding my head with her hands to make me go on; it was a most deliciously enjoyable gamahuche.
1897		School Life in Paris 60: She offered to show the eldest one the ‘gammerouge’ which [...] in the case of a male [...] consists in kissing the point of his ‘dolly’ until the action of the tongue causes it to ‘come’ .
c.1900		‘Ramrod’ Family Connections 27: I’m, rather fond of young cunts, too. I mean to have a go at Lottie’s soon. She’s just about ripe for a gameruche.
1977		D. Powis Signs of Crime 185: Gamerouche Taboo word for fellatio. Never used in mixed company.