A phrase common among youngsters and especially young teenage girls, who often push their boyfriends to say it too. This phrase is used by people who want to sound like a 'gangsta' or 'rapper' and want to sound cool.

Don't use it.
Usually people say "hey that phrase is mine" when NO, really they heard it off someone else. You did not make this phrase up yourself so shut up.
Girl 1: "ahhhh Lisa that chicken mayo was soo tasty"
Lisa: "haha, yeah boii"

Bystander: "urgh, why does she say that, she's just trying to be cool"
Bystander 2: "yeah, what a loser"
by i OWnyou February 2, 2010
Get the yeah boii mug.
when you are showing a Grand expression to enlighten other people around you or to show your dominance!
ME: (walks in to room full of friends) yeeaah boii!!
everyone: OH SHIT !
by saltmaster April 14, 2011
Get the yeeaah boii mug.
A fuck-boy too lazy to get on top
Sexually active male who during intercourse resembles the recliner of similar name
"damn, did you hear about whats-his-face?"
"no, what?"
"Tina says he just laid there while they did it!"
"Wow, what a Lazy-boii."
by DarbTheGreatist February 1, 2017
Get the Lazy-boii mug.
Someone who you can trust on anything someone that has your back and you got theirs. Someone you'll take a bullet for someone has to be so special to be know as mahh boii .
by revoe420 June 26, 2014
Get the mahh boii mug.
Big Smoke: I'll have two number 9's, a number 9 large, a number 6 with extra dip, a number 7, two number 45's, one with cheese, and a large soda

Lvl 97 memer: Oh boiiii
by Trebuchetcanthrow90kilograms January 18, 2017
Get the oh boii mug.
ultimate innocent slow boy, some say the worst insult ever!?
Mac Pow is not a fontii boii!?
by KipPow December 1, 2009
Get the Fontii Boii mug.