King Boo

Luigi's nemesis. First appeared in Luigi's Mansion (2001).

Luigi saves Mario, Peach, and all his friends from King Boo.

by mrdrmaster March 27, 2021

gung boo

Any unknown disease.

I got the gung boo from your girlfriend.

by chad hattenburg July 3, 2007

William Boo

The Biggest Simp

Omg, that guys such a William Boo

by JJs Juicy Forehead August 19, 2020

Beanie Boo

An adorable plushie with big eyes made by the company Ty.

I have now 131 Beanie Boos and I'm 1 decade old not 5.

by 『Pastel_Beanie_Boo』 July 19, 2021

bizzle boo

A name for your best friends. You can use it when you are referring to your favorite people and when you are joking and calling each other names!

Hey you little Bizzle boo! I've been looking for you everywhere!

by Bizzle Boo June 4, 2016

Boos flu

A state where a Human catches a virus know as the boos flu (originating from animals). This virus cause one to laugh at any joke whether it's funny or not. Over time the laughter gets so out of hand that one's system can no longer take it and shuts down, therefore leading to death

Sophie got the boos flu last night, sadly her brain found humor at random times therefore leading to her passing

by Ozatech July 5, 2020

boo nigga

the act of calling someone out when they say something out of pocket.

Sike, Boo nigga!
Justin Tilton, you’re such a boo nigga.

by booooboooooniggggahhh June 29, 2023