The sexual attraction, arousal to vomit.
This 'disorder' or 'attraction' takes different forms, centered around vomit.
It can refer to one who becomes aroused by actually throwing up, or being induced to throw up.
Can also be in seeing another vomit, or forced to vomit.
Also can be about vomiting on their partner, or vice versa. (known as a Roman Shower)
Sound of one vomiting, in the throes of regurgitation, can be the sole draw, or any combination of sound, action.
It is believed to stem from a desire to be dominated, or to dominate an other.