The ridiculous tuft of hair known as a goatee on guys who want to be taken "seriously". The 2000s version of the "mullet". Taken from the slang "Hillbilly" and "Goatee". Most often seen in conjunction with shaven heads.
"Hey, look at Mr. Badass with the Billygoat and wifebeater shirt! I bet he has a barb-wire tattoo!"