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Used to indicate that the other person completely failed to understand or appreciate the point of what one said, especially a joke. It is a reference to the idiom "go over someone's head," alluding to an imaginary "whooshing" noise created as it passed. A: "My uncle is reading a book about anti-gravity technology. He says he can't put it down!" B: "Oh, wow, that does sound really interesting." A: "Whoosh."
mod. alcohol intoxicated. Jerry was totally whooshed by midnight.
See also: whoosh