Green’s Dictionary of Slang

Sigourney Weaver n.

[rhy. sl. = beaver n.1 (5); ult. US film star Sigourney Weaver (b.1949)]

the female genitals, esp. the pubic hair.

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[UK]Roger’s Profanisaurus in Viz 87 Dec. n.p.: Sigourney Weaver rhym. slang Beaver; Davey Crockett’s hat.
[UK]B. Dark Dirty Cockney Rhy. Sl.