An informal way to call your friend or to exaggerate an achievement.
P1: Wassup boi, i just got a double nuke in codm today
P2:Good job mah boiiiiiiiiiiiii!
The word "Boi" is in use when someone does something stupid, hand is also extended pointed at the person that did it
Guy: i haite english but lave reading
Class: Boi, dumbass
A generalised noun used in combination with the most destinctive feature/s of something, to give it a new, better name.
Person 1: Pass me some of those green bois
Person 2: *passes brocolli*
Person 1: Did you hear Patricia had a loud boi yesterday?
Person 2: Oh yeah, her baby is so cute!