An exclamation of excitement, agreeance, approval, or a greeting upon entrance usually uttered by young males. It is commonly pronounced with a higher pitched and drawn out "bay" followed by an equally lengthy and lower "o"
Arle's 7th spell in the Puyo Puyo series. She dances around like a fucking monkey while shooting nuisance puyos and flowers out of her body or something when doing the bayoen.
Someone: Yes! I think my puyo chain is gonna go over 7!
Arle: BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN! BAYOEN!