Vomit

From CaseyPedia

Vomit is usually an involuntarily ejected fluid from a persons' stomach or oesophagus. It's usually a harbinger of illness. In the case of many Haterz™ though vomiting has become a common response to KC's statements such as "Excuse me, I just vomited a little in my mouth when I read that....". Whether this is indicative of a contagion picked up through some form of unknown transmittal method is not yet known.