Similar to Bukkake, this is a Japanese sexual act where the male reaches emission without coitus. Unlike Bukkake, where the male ejaculates directly onto the female (usually the facial area), in the practice of Gyukaku, the male will ejaculate onto a hot charcoal fire. The girl must then inhale the fumes.
Last night I took Kumi home and fired up the hibachi. The Gyukaku was awesome. She took in that steam cloud like a champ.