On Billy goat is when your really religious so you cant say on God so your just say on billy goat
First meaning - Me"On billy goat I am gonna beat yo ass If you touch me!"

Second meaning - Me" On billy goat we gonna rob this bank" friend "On billy goat we are!"
by Simba_goose July 9, 2019
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A male Cougar... A man who is seven years old than the woman he is with and/or dating he is a Billy Goat(Male version of a Cougar)
That man likes younger woman, he's a billy Goat...
by Reactor11 September 16, 2007
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Just prior to a woman performing felatio, you shave your testicular region and keep the shavings in your clenched fist. Upon fruition, the male makes his deposit on his victims chin, then immediately throws the hair in his fist on to the lucky ladie's face. The hair that remains will form a lovely Billy goat beard on her chin.
Duffy just shaved that shit and got caught Billy Goating the neighbor.
by Pappa Lang May 20, 2015
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Having such rough intercourse that someone ends up in the Emergency Room.
“I billy-goated that girl so hard, she had to go to the hospital!”
by ambulancegurl13 July 10, 2018
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Damn dude, Look at those billy goats! I just wanna suck em!
by Rob Lussier June 7, 2006
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When a man covers himself in "I cant believe its not butter" runs on a tile floor and rams his dick into the female. Much like a billy goat would ran its horns,
Billy S needed to go to the hospital after a rough slippery billy goat
by Dyl Ketz March 11, 2014
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