Green’s Dictionary of Slang

to perform oral sex; thus gamahuching, fellatio or cunnilingus; gamahucher, one who performs oral sex.

c.1788		‘R. Birch’ ‘Venus School-Mistress’ in Pettit & Spedding 18C British Erotica III (2004) 42: After having stripped her, he began to gamahucher her for some minutes.
1865		E. Sellon New Epicurean (1875) 13: ‘Quick, quick, Blanche!’ cried Cerise, ‘come and gamahuche the gentleman.’.
1870		Cythera’s Hymnal 45: Whose tongue could always find its way, / Whether in the dark or day, / To where my little clitoris lay? / My Gamahucher’s .
1879–80		Pearl (1970) 271: You may frig and gamahuche and try every plan, / But fair fucking’s the pride of an Englishman.
1884		‘Experiences of a Cunt Philosopher’ in Randiana 98: The ‘gamahuching,’ process should only be employed as a preliminary. [...] No woman living is able to stand a moist and well-trained tongue.
1884		‘Experiences of a Cunt Philosopher’ in Randiana 126: Gerty, whose ravishing manner of gamahuching me recalled so vividly my first seduction of her.
1888–94		‘Walter’ My Secret Life (1966) I 115: I had gamahuched her till she spent. [Ibid.] IX 1750: ‘You must gamahuche it then.’ — ‘I won’t gammerouss,’ said she.
1897		Flossie: A Venus of Fifteen (1902) 12: And thrusting my yard between her lips, the Great White Queen of the Gama Huchi Islands sucked in the whole column to the very root, and by dint of working her royal mouth up and down [...] soon drew into her throat a tribute to her greatness.
1898		‘Mary Suckit’ Yvonne 50: And probably you made her gamahuche your prick [...] You put it into her mouth and poured out your spunk between her lips.
c.1900		‘Ramrod’ Nocturnal Meeting 29: Gameruche the litle bitch.
1956		‘Little Jim’ in ‘Count P. Vicarion’ Bawdy Ballads XXIX: Now Jenny was a whore in good old Cambridge town, / Who had gamahuched the Proctor while he wore his cap and gown.
1973		(con. 1940s–60s) Hogbotel & ffuckes ‘Craven A’ in Snatches and Lays 43: Now Susie was a prostitute from Melbourne Town, / She gamahouched a Proctor in his cap and gown.
1984		Partridge DSUE (8th edn).
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Gama. To fellate. Sometimes gamaroosh or gamarouche.
1984		B. Ellem Doing Time 189: gamma: to have your penis sucked by another prisoner.
2024		J. Meades Empty Wigs (t/s) 158: For a shilling they gobbled rich young gentlemen: gamahuche was the word then, it’s got a nice feel to it.