Green’s Dictionary of Slang

feather v.

[SE phr. feather one’s own nest]

(US) to curry favour with, to toady to.

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[US] in DARE.

In phrases

feather the bird (v.)

(US prison) to have man-to-man sexual intercourse.

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[US]in G. Legman More Limericks (1977) 622: A handsome whore-hopper named Shumate / Acquired him a masculine screw-mate. / As they feathered the bird / There came up a third, / Who said, ‘Let me in on that, too, mate’ [Simes:DLSS].