A definition of male individuals with a very high intelect and a big wank, must be used with caution.
Jimmy: wussup mah man
Troy: wussup mah *Boi*
Jimmy * Jimmys brain size increases by 5 tons and his wank grows to a astonishing length of 27 lightyears, piercing gods head and with that ending the chruches with gives the german, bold satanists to overrun scientology and rape the aliens.
Another way for saying boy, but to make you sound cool
You: Hey Bois
Cool kids: shut up moron
Back in the day racist white men wouldn’t use African Americans names instead calling them boi
“What you doing around here boo”
“Come here boi”
For all of you using boi as a replacement for "boy" you might be surprised to know that the term was coined by lesbian and transgender women for those that would dress and act as men, way before it ever became slang.
Look at that boi over there, she's cute.