Used to describe
a person being an idiot / being incredibly silly and stubborn. Originating from the billy goat itself, because
of its outward ridiculous appearance (big horns and a beard... You be the judge) and because
of their mating habbits. Two males fighting over a female will
run at each other and butt heads to impress the female, which really, is a stupid way to go about it.
Literally: Somebody who goes around
and headbutts people.
Rodney is one crazy fucker, who will do anything for a laugh. Always acting the billygoat, that one.
Tom: What's wrong? And what's with the bruise on your forehead?
Jane: Jack. He loves
acting the billygoat... Especially in bed.
Tom: Now, that was too much information.