The Turnip Glitch is a Super Smash Bros. Melee glitch discovered by Afrotaki circa December, 2002. Despite its name, the Turnip glitch can be performed with any item that can be held in one hand. The glitch involves a thrown item remaining stationary in the air and keeping its hitbox, even when it should have disappeared.
The glitched item will remain in place until the end of the match. It can be air grabbed and moved to another spot where it will continue to behave glitched. When holding an item affected by this glitch, the item behaves normally until thrown. How this glitch is performed is still unknown. The Turnip glitch is similar to the Yoyo glitch in that it creates a free-floating hitbox.
The glitch was discovered in a match involving two Peaches and the glitched item was the inspiration for the glitch's namesake. Due to the unpopularity of items, it was thought for a long time that this glitch only affected Peach's Vegetables, but was eventually found to effect any item that is light and can be picked up.