Billy 

A uncivilised individual with the intentions of creating terrorist attacks. They usually wear overalls.

Man: "Hey have you heard of that recent terrorist attack that happened in Ohio?"
Women"Yep i heard it was done by a Billy"

Billy by Nonbank June 9, 2018

billy 

A billionaire. And no, "billy" is not derived from Bill Gates.

Bill Gates may be a billy, but Steve Jobs is a superhero.

billy by RoddickRemixed October 20, 2007

billy 

Another name for the penis.

Put your billy away!

billy by Trey Smart July 26, 2007

Billy 

A pansexual dilettante and/or sequential hermaphrodite who makes odd, senseless statements and spills his Dairy Queen upside down trying to be like the commercial.

Awesome Guy: Why'd you dump out your Blizzard on the ground?

Billy: They did it on the commercial.

Awesome Guy: You're such a pansexual dilettante and/or sequential hermaphrodite. Shut up.

Billy: Okay.

Billy by NotBilly July 18, 2009

Billy 

A guy who thinks he is all that but is actually an immature fat jerk

Billy is so stupid

Billy by SwimmerGirl223 September 2, 2016

Billy 

Somone who has a 99% chance of owing you money

Hey can you spot me for a sweatshirt- billy, I’ll pay you back next Friday -billy

Billy by Billy billy May 14, 2019

Billy 

A retard who thinks urban dictionary is the best thing in the world.

Oh my god, Billy's gonna search this on Urban Dictionary.

Billy by BakedBeans2005 September 17, 2019