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
by Tyrannosaurus Rocks April 30, 2006
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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
by Huy N. Luu December 30, 2004
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Flav-o-flav's famous catch phrase signifying that things are all good, but if it is said really slow with a low tone, it can be used sarcastically to indicate that you really dislike something....
(yeah boy) yeeeeeaaaahhhhhhh bbboooooyyyy I'll take the oon-call pager for the weekend...

(yeah boy) yeeeeeaaaahhhhhhh bbboooooyyyy I'm so glad that the chick I took out last night was really a guy...
by E-ROCK123 October 15, 2009
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yeah boy!! is commonly known in the borough area of london, specificaly in the rose and crown pub.

it describes a feeling of want, happiness and excitment after drinking a pint of cool aid and eating a plate of pigs feet.

i love pigs feet yeah boy!!!!
JOHN - ...........ALAN DO YOU WANT A BAG OF PIGS FEET?

ALAN - .....YEAH BOY!!!.............I LOVE PIGS FEET!!!!!!!!
by ALAN MULLINS April 5, 2006
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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!!!!
by niggah skye June 12, 2006
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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
by iluvdrayke October 12, 2017
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To Enlighten people of you're Grand excitement or to show your dominance
ME:(walks into room with friends) YEAH BOI

Friends: OH SHIT!
by saltmaster April 13, 2011
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