Boin

n. Large breasts. A Japanese slang term adapted from a transliteration of the term "boing" which, as we all know, is what good breasts do.

Dave: So much ii boin here at this anime convention, amirite Steve?

Steve: The only "boin" I see is attached to fat dudes, you blind weeaboo. Get some damn megane already.

by Estrella Muerta December 9, 2008

boing

To have an erection.

He boinged at the sight of the girl on girl action that was 89.com.

by Turtle October 22, 2003

Boingo Head

A person who loves the band Oingo Boingo to a fanatical degree.

Person A: I want to have an orgy with every member of Oingo Boingo and their sisters while listening to The Oingo Boing Anthology!!!!!

Person B: You are the biggest Boingo Head!

by Dr. Terwilliker November 12, 2005

boing flip

As seen on popular television series, Scrubs. If someone is to insult you, and you want to give the same insult back, all you need say is boing filp, fliping the insult right back at the persons face.

Alex: God Ella, why do you always have to be so annoying???
Ella: Boing Flip!

by ella-bella22 August 25, 2006

boing

sound effect of a spring contracting/extending

*boing* boy: wow that was a spring.

*byorng* other boy: wow that was a swedish spring

by Hamburher April 19, 2020

boingdat

An unathletic black person

I didn't realize he was a boingdat until I saw he couldn't dribble a freakin basketball!

by T-Good January 2, 2009

boingly-doinglies

Particularly large breasts.

She waved her boingly-doinglies at me and I was smitten.

by Frugen April 5, 2007