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Michael Lohan got mixed up in a stinky situation at Boa Steakhouse in West Hollywood on Saturday night -- he was accused of throwing up on someone!

The belligerent young woman who accused Michael of the vomit assault was swearing up a storm outside the steakhouse. While others told a different tale, Michael assured our photogs he was not the puker.

Watch our video above to get both sides of the story!