Green’s Dictionary of Slang

yodel in the canyon (of love) v.

1. (US) to fellate.

implied in yodeler n.

2. (also grin in the canyon (of love), yodel, yodel from the highest tower, yodel down/in/up the valley) to perform cunnilingus;thus canyon yodeler, a cunnilinctor.

[US]‘Mae West in “The Hip Flipper”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 95: Grasping our beauteous heroine by the haunches he yodeled in the canyon to Lotta’s delight.
[US] ‘Pete in “No Pay”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 43: I’d never yodled [sic] in the valley before.
[US] ‘You Nazi Man’ [comic strip] in B. Adelman Tijuana Bibles (1997) 131: The great Hipler grins in the grip, snorts in the gulley, yodels in the canyon and sneezes in the satchel.
[US] ‘Hotel Sl.’ in AS XIV:3 Oct. 240/2: to yodel To indulge in unnatural intercourse.
[US]G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 74: If you wanted to yodel up the valley youse had your chance back in the studio.
[US]R. Abrahams Deep Down In The Jungle 214: [O]ld dirty slim was what you would call a bushwacker, a nose diver, a canyon yodler, well in other words a cocksucker, or just say that he ate pussy. He was also a puck lover, and a whore mongler, in other words he was just plain dirty Slim to everyone.
[US]Guild Dict. Homosexual Terms 50: yodel in the canyon (of love) (v.): To practice cunnilinctus; very widely used in the U.S.A.
[US]B. Rodgers Queens’ Vernacular.
[US]E. Folb Runnin’ Down Some Lines 155: Eatin’ pussy. I don’t do none dat canyon stuff! [Ibid.] 158: Expressions [...] that are [...] euphemistic (to dive/yodel/sneeze/grin in the canyon). [Ibid.] 231: canyon, dive/grin/sneeze/yodel in the Engage in cunnilingus.
[US]D. Lypchuk ‘A dirty little story’ in eye mag. 8 July 🌐 On the jewelled terrace he growled at the badger, blew some tunes and went way down south in Dixie, where he found himself grinning in the canyon.
[UK] ‘Be A Cunning Linguist’ in Maxim Feb. 🌐 Yodel down the valley: Gunter was too tired to talk, having spent most of the day yodeling down the valley.
[UK]Indep. Rev. 1 Oct. 5: He does indeed yodel from the highest tower.