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A Top gun Thumbs up is similar to a regular thumbs up, only its held for much longer and you turn your hand to the side so the person youre giving the thumbs up to, can see the back of your hand.
its called a "Top Gun Thumbs Up" because during the entire film, that is all Tom Cruise and Val Kilmer ever did, never giving proper thumbs up to each other and at times, it seems as though their right hands are permenantly STUCK in that position.
not really possible to do an example of a Top Gun Thumbs Up... just watch Top Gun!
by The J. September 02, 2005
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