This sound is from Rubbadubbers: Sploshy Soundboard

Splish, Splash, Splosh! Sploshy has come to make prank calls with this new soundboard! Credit goes to the legendary Maria Darling for her incredible work voicing Sploshy from Rubbadubbers.

UPDATE (12 February 2021): 73 new sounds have been added to 327 since the soundboard's initial release, rounding up to a total of 400 sounds.