An extremely dangly, wooly, hairy scrotum.
Dude!!! Invest in a razor and loose the goat's gruff. How does your girlfriend suck your balls?

I saw my grandpa's goat's gruff last night. I don't think I will ever be the same.
by Eaton Holgoode April 24, 2017
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type of goat you see in child story tales. kind of mystical, like you would see a Borak Warrior riding one, but they always roam the mountain tops in search to fight a cougar or somthing like that. so all in all just a kinda goat... Whats a frink?
man i was climbing that sweet mountain and i got attacked by a billy goat gruff
by CODY WHYTE August 5, 2006
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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 1, 2017
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