This is a baseball pitch that gets the kind of spin similar to a spiral thrown by a quarterback in American football.
There is much debate as to whether the pitch actually exists, but Japanese pitcher Daisuke Matsuzaka allegedly throws such a pitch, similar to the slurve(cut fastball/slider) but he is usually extremely vague, saying that he has only seen the gyroball-- in japanese comic books.

www.youtube.com/watch?v=PQCbvYwHPoA

This is NOT my website, but there are a number of sketchy videos on the internet such as this where it is unclear what kind of spin is on the ball. If and when Daisuke Matsuzaka signs with a major league baseball team(as of october, 2006 he has only pitched in japan), people will surely be talking about the gyroball.
The gyroball is a mythical pitch in baseball that like bigfoot, may or may not exist.
by devin_ November 1, 2006
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A japanese "strike-out": sake included.
Damn, that guy is a matsuzaka gyroball champ, which of course means he can hit a bong, drink beer, take a shot of sake, and then blow out the smoke like a pro, a pro in drinking games, like in beerfest, which is a movie where a fat black woman says i like my hot dog with mustard and goes down on a man with an asshole beercase helmet and a yellow dick. I would pay a 51 million dollars just to get a chance to see a matsuzaka gyroball.
by Fa;ksjdfa;sdfie November 16, 2006
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