When your friend is so hammered that when he is peeing outside and you are standing behind him waiting for him he turns around for a split second and pees on your.
Jack: Dude why does your leg have piss on it?
John: George thought it would be funny to do a yellow flash on my leg.
You have an absolute fetish for Asian women, usually Japanese from watching to much anime and manga. The term was formed from a game on Steam called "Huniepop". Usually the only cure is to hook them up with an Asian girl.
Jeff has been watching to much of Thean1meman and I think he has yellow fever.