The Sparkle Slime Balloon is a Hardmode novelty consumable item. When thrown at players, enemies, and NPCs, it will inflict the Sparkle Slime debuff for 30 seconds. This debuff is only cosmetic and deals no damage.
Queen Slime always drops 25–75 balloons upon her defeat.
It can be considered a Hardmode counterpart to the Slime Gun.
The tooltip is a reference to the "Gamer Girl Bathwater" product sold by Belle Delphine during 2019.