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

Boin

Boin is a unknown object, usually related to ones balls, and or beans.

"I'LL DESTROY YOU WITH MA FUCKIN' BOIN"

by MichaelAFS_2022 August 25, 2019

boin

Synonymous with "to burn", used only when implying the use of marijuana.

Who wants wants to "boin" (some sweet nuggets)?

by Midnight Tokers April 26, 2006

Boin

Cigarette

It's not merely the smoking of ones boin that defines you as a man

by Uncleboozer August 22, 2019

Boin

Synonym for "Normie." Used to describe them, considering saying "Normie" is now a thing that normies, or rather, boins, now do.

Get this boin out of here

by Confetti-Throwing Puppet July 29, 2018

Boin

-verb (used with or without object) to engage in the act of sexual intercourse or the conglomeration of two separate genitals. Commonly used to replace the f word so children who shouldnt be hearing the f word due to their young/virgin ears wont be corrupted. Usually spoken by realists.

Ex1: Danny, are u going to boin the "silly rabbit" tonight or not because if you need a ride to her house I will be off work at Bravo at 7.

by verbatim4ever March 30, 2010

boin

to land on

*ROLLS A 5*
Jordan: 1, 2 3, 4, and 5,
Awe shit, I landed on your boin.
Now what?

Breyanna: Who won the race?

Jordan: I dunno

Breyanna: CHARLIE DID
*gives jordan a charlie horse*

by breyanna and jordan =) June 30, 2008