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A word used to express excitement, agreement or can be used to replace most words. Example; “Yeah Bo, what you doin?”. Can also be a word used when not properly thinking a situation through. A diverse word that can be shortened to “Bo” also.
*2am and work the next day*
The boys: “Bro want to head out and have a fire on the beach?”
You: “Hmm... YEAH BO!”

*When your mate does something stupid*
You: “What are you doing ya bloody kook bo?”
Yeah bo by The OG “Yeah Bo” August 9, 2018

Yeah Boi 

Flava flav's slogan. you can say it anytime.
boi=boy
"are we going to the clubs tonight?"
then you can say "YEAH BOI!"
Or
When you see a girl with a hot ass, you can also say
"YEAH BOI"
but you have to shout it out!!!!
Yeah Boi by niggah skye June 17, 2006

Yeah Boi 

when youre very excited or happy of something and the only way you can express yourself is by saying "Yeah Boi"
person 1: Do you want some mcdonalds?

Person 2: Yeah boi
Yeah Boi by iluvdrayke October 20, 2017

yeah boy 

Flava Flav's Public Enemy catchphrase. It usually starts the shit, with Termanator X and Chuck D bringing it afterwards. However, anyone can say it, as long as you mean it. It is one of the most positive things you can say. It's the best.
Chuck D- Somebody in the house say yeah. If you really like to rock the funky beats, somebody in the house say HELL YEAH.
Flava Flav- YEEEEEEEEEEEEEEEEAH BOYYYYYYYY

or

Friend- You want to go get some tacos and tequila?
You- YEAH BOY

yeah boy 

a sign of great awesome-ness, everything is good in the hood and no shit can change it, a moment that gives excitement to the user and/or people around
YEAH BOY! THAT AN AWESOME ASS

yeah boy! the vacation was filled with parties

oh shit you see the street fight? yeah boy!

she was dancing in the club and i was like yeah boy i gotta get that
yeah boy by Huy N. Luu December 30, 2004

yeah boi 

To Enlighten people of you're Grand excitement or to show your dominance
ME:(walks into room with friends) YEAH BOI

Friends: OH SHIT!
yeah boi by saltmaster May 3, 2011