It's Goku's 'spin' on the Hurricane Kick. Great move to use in combos.
He jumps up and forward at an arc, the distance depending on which button was pressed to activate it with.
The Weak version deals two hits and doesn't knock the opponent away. The Medium and Strong version do knock the opponent into the air after the first hit, turning it into a juggling move.
The Ex version becomes the Super Hurricane Kick, where Goku leaps through an even larger arc and dealing a lot of hits.
All versions have two possible follow-ups (Except the EX version which can only do the first of these two);
-Blur Kick - QCF+K. Upon landing, Goku busts out his standing strong kick, knocking the opponent away. The command can be inputted at any time
but the Blur Kick will only come out upon landing.
-Boomerang Kick - QCB+K. This needs to be inputted during the flying part. Goku performs his jumping strong kick, which
smashes the opponent down and causes a bounce-juggle when hitting an aerial opponent. Also, discovered by fans,
performing the Boomerang Kick at the last moment (just before landing) allows you to land and instantly
perform another Hurricane Kick, which can leads to some real wicked combos.
The aerial version doesn't arc upward, but forward. The stronger the button input, the more forward range Goku will gain.
Excellent way to finish off an aircombo with, especially with the Boomerang Kick option. As with all these type of moves, the bounce-juggle feature will only be triggered once during the same combo to prevent infinites.