An asian woman/moan. Derived from the fact that in Asian pornography, whenever the woman is touched, she squeals and moans in a 'Gyu' ish fashion. Pronounced "Gew/Gew-er".
"So I was totally railing this broad and WOULDN'T shut up. She was all like "Gyu! Gyu! GyuuuuuuuuuuUuUUU"
"Daaaamn check out that Gyuer over there! I wanna see her is a promiscuous way! "