Green’s Dictionary of Slang

mount-faulcon n.

[lit. ‘mount falcon’; coined by lexicographer John Florio (c.1553–c.1625)]

the vagina.

1598		Florio Worlde of Wordes.
1847–81		Halliwell Archaic and Provincial Words II.
1890–1904		Farmer & Henley Sl. and Its Analogues.