The transformation of a fully functional human being to a human being that is not functional because of a horrid episode of vomiting usually caused by food, drugs, alcohol, or all three combined. Hence the word yak. Word is Russian originating from the comedian Yakov Smirnoff.
Yo bro, i totally got sick at last night's party. Ya man, you totally turned into to Yakoff Smirnoff. Ya man a total yakoff episode.