when someone, usually a female, gets their pubic hair cut into the shape of a farmland animal, preferably a goat.
"alex told me his ex girlfriend laura got a billy goats gruff yesterday"

"dude, seriously?"

"yeah..her dad did it for her!"
by Alex Lee in plymouth December 16, 2007
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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."
by Blair.Finnie February 01, 2017
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