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sloshing balls
When a character's balls make sloshing, gurgling or churning noises, as if there is fluid moving within the balls or being pumped within them, indicating an abundance of cum or arousal in general. While physically impossible, it's taken as artistic license to reinforce the virility of the character, the size of their balls, or how "backed up" a character is. Often paired with huge or hyper balls, and may be often seen in fetishes like ball expansion or cock vore.
