Green’s Dictionary of Slang

Alpine mountains n.

[the shape and the ‘snowy’ whiteness of the flesh]

(UK Und.) the female breasts; thus crossing the Alpine mountains, sleeping with one’s head pillowed on a woman’s breast.

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[UK]Duncombe New and Improved Flash Dict. n.p.: Crossing the Alpine Mountains sleeping on a woman’s bosom; they found him snoozing with his doxey, crossing the Alpine Mountains.