yaoi boi Share definition Flag This is a gay male, in anime. i refer to my frineds as then, but there not. one of my friends is just the ya, not oi . (you kmno who u are) ¿peAce? yer a fukin yaoi boi yaoi boi by BRIAN A FRINED OF CLINT November 5, 2003 Get the yaoi boi mug.