The Item Spin Jump is a basic trick used in the Super Mario World game style to allow Mario to carry an item while Spin Jumping. There are many different techniques for spinning with items. This trick is not needed in the New Super Mario Bros. U game style as you can already Spin Jump with items.
How It Works
Mario is unable to start a Spin Jump while holding an item, however he is able to grab an item in midair and continue spinning.