'Boyyy' simply means nothing can ever beat it, there is no otherword that can top 'Boyyy'. If something is Boyyy you know you couldn't miss it for the world.
me: oh man did you see that girl last night
mate: No bro I didn't
me: Trust me she was BOYYY
Your mate does a triple summersault, that was BOYYY
By Marcille
Boyyy Stop
Something that Big Boi of Outkast says in a really weird voice several times on Sir Lucius Leftfoot.
Boyyy Stop.... SirLucius Leftfoot On fire, trying to block my shine just ain't going happen so don't try