Boo Repellent

From the Super Mario Wiki

Boo Repellent is an item found solely in the game Mario Party 3. It has a similar effect to Mario Party 4's Gaddlight.

When Boo tries to steal coins or a Star from a player holding a Boo Repellent, the item automatically activates, spraying weird gas at Boo, causing the pickpocket specter to flee. Boo Repellent can only be used once. It is also possible for a player to throw away a Boo Repellent at the start of their turn to make room in their inventory, although it would count as using an item during user's turn.

Items from Mario Party 3
Items bought from Toad	Boo Repellent • Cellular Shopper • Dueling Glove • Golden Mushroom • Item Bag • Magic Lamp • Mushroom • Skeleton Key • Warp Block
Items bought from Baby Bowser	Boo Bell • Bowser Phone • Bowser Suit • Item Bag • Lucky Lamp • Plunder Chest • Poison Mushroom • Reverse Mushroom • Skeleton Key
Rare Items	Barter Box • Koopa Card • Lucky Charm • Wacky Watch