Boy-yoy-yoing
An imaginary sound referring to an erect penis when excited. A large pair of breasts make the same imaginary sound when flopping out of a bra or bouncing up and down.
Holy shit did you see the tits and ass on that chick? Boy-yoy-yoing!!!!
boy-yoy-yoing
Incredible shock value
Her new Nike shox had so much boy-yoy-yoing!