Green’s Dictionary of Slang

spleuchan n.

[Gael. spliùchan, a tobacco pouch, a purse]

the vagina.

1890–1904		Farmer & Henley Sl. and Its Analogues.
1896		Farmer Vocabula Amatoria (1966) 192: Moule, m. [...] 2. The female pudendum; ‘the spleuchan’.