Shorthand for yabai (ヤバイ) , a very flexible japanese word that means something crazy (usually dangerous) has happened. Popularized in virtual youtuber chat room.
> A youtuber is reviewing NSFW artwork of herself
> Accidentally showed a loli version
> Viewers: YAB
> Accidentally showed a loli version
> Viewers: YAB
by lumi89 November 13, 2020

Bill : "do you wanna go yab right now."
Andrew: "hell yeah."
Tyler: "yo you should go take a yab."
Jimmy: "i'm already yabbed out, maybe later."
Andrew: "hell yeah."
Tyler: "yo you should go take a yab."
Jimmy: "i'm already yabbed out, maybe later."
by DJ-CRICCI August 11, 2016

Yab!
by CFK72 September 13, 2022

by yabab July 15, 2011

The Art of sex through the nostril.
by metaljack August 11, 2006

by Teh Panda January 12, 2004

by chaggy February 26, 2009
