Green’s Dictionary of Slang

busby n.

[SE busby, the tall fur cap as worn by various regiments of the British army]

the vagina and pubic hair.

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[UK]Farmer & Henley Sl. and Its Analogues.

In phrases

growl in her busby (v.) (also growl in the busby)

to perform cunnilingus.

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[US]L. Sanders Pleasures of Helen 91: [He] was [...] down on his knees, clutching her legs, his face in her lap, all ready for a session of growling in the busby.
[UK]Partridge DSUE (8th edn) 508/2: 1974.