From the Super Mario Wiki
Interrupting Frame is an offensive item found in Mario Kart Arcade GP 2. It homes onto the opponent once locked on. After the opponent gets hit by the item, multiple, moving frames of the character that has thrown it obscure the opponent's view, not too much different from the effects of a Blooper in other Mario Kart games. Like most other items in the game, it eventually fades away after a set amount of time.