This is a Hacienda Post and/or Jeff Hutchins sound effect, which is standalone but often is mixed with Sound Ideas, SQUISH, MUD - SINGLE MUD BUBBLE SQUISH 02.
It sounds similar to/may be a modified version of Sound Ideas, SPLAT, CARTOON - WET HIT 02.
It's generally only used by Hacienda Post/Sabre Media, but it's also used in some Oracle Post/Atlas Oceanic/Sound Rebels projects, since Jeff Hutchins' project Spongebob Squarepants uses those sound facilities as well.
- Adventure Time
- The Amazing Adrenalini Brothers
- The Life and Times of Juniper Lee
- The Marvelous Misadventures of Flapjack
- Out of Jimmy's Head
- The Ren & Stimpy Show
- Samurai Jack (Heard in EPISODE XCV for some creature's footsteps)
- SpongeBob SquarePants
- Teen Titans Go!
- Wander Over Yonder
- The SpongeBob Movie: Sponge on the Run (2020)
- Tom and Jerry: Blast Off to Mars (2005) (High Pitched)
- Tom and Jerry: The Fast and the Furry (2005) (High Pitched)