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Billy Goat's Gruff 

English rhyming slang for muff aka pussy, female genital region.
Billy Goat's Gruff by bigrattus November 21, 2003

Billy Goat's Gruff 

When a male ejaculates up and onto his partners chin, imitating The Chin hairs on a Goat
" Aw Yeah I Pulled Out And Gave Her A Billy Goat's Gruff."
Billy Goat's Gruff by Blair.Finnie February 1, 2017