From the Super Mario Wiki
The Slowgo Candy is a Red Candy in Mario Party 8. It has the combined effects of the Sluggish 'Shroom Orb and Poison Shroom items from past Mario Party games. When used, it lets the player hit a slow-moving Dice Block with 1-5 on it. It is usually more expensive than the Twice Candy, costing 10 or 15 coins. It has a picture of a green Dice Block on the wrapper.
The Slow Dice Block from Mario Party 9 and Mario Party 10 has a similar affect to the Slowgo Candy.
Names in other languages
||Moviola Candy (the Moviola is an old device that allows a film editor to view film while editing; it's also used to indicate a slowed image sequence)