This splat comes from the Hanna-Barbera cartoon sound effects library, later distributed by Sound Ideas as a cartoon paint-fight glop, a staple of the exaggerated noises used across classic animated slapstick. Similar wet, squelchy impacts were reused for decades because they instantly told audiences that a character had been covered in something messy. As clips moved onto soundboards and editing timelines, creators kept reaching for it for the same reason: it is short, instantly readable, and funnier than a realistic splash, making it a reliable shorthand for cartoon mess.