Boo Massacre

When you jump around a corner yelling "BOO" and jacking off whoever comes around the corner.

"I did a BOO massacre on Thomas"

by PanHeadSean June 30, 2022

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

Hannah Boo

A mistake, accidentally created when someone tries to say Mari Boo and messes up.

Connor- "Nobody touches my Hannah Boo!"
Hannah - *WHEEEZE* "Hannah boo"

by Mang0w0 Alt June 14, 2020

Boo-cocky

Jizz on your face

“Im going to be so honest boo-cocky means jizz in your face”- that one asshat in “Why Him”

by edsheeranspiss April 22, 2023

William Boo

The Biggest Simp

Omg, that guys such a William Boo

by JJs Juicy Forehead August 19, 2020

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 28, 2021

gung boo

Any unknown disease.

I got the gung boo from your girlfriend.

by chad hattenburg June 09, 2007