Pro Sound Effects, Stomach, Stomache, Gurgle, Rumble, Queasy, Hungry, Hunger, Growl, Gas, Indigestion, Intestin, Intestinal 01

This sound effect can be found on the Soundrangers Sound Effects Library, which was made by Pro Sound Effects.

Clean, Full Length and Unedited Link to the Sound Effect

The Buzz on Maggie
Chibiverse (Heard 6 times in "Chibi Villains Unite" in the segment "First Date Fright"; used on Marnie Piper.)
The Expecting (Heard once in "Inside"; used on Emma.)
The Ghost and Molly McGee (Heard once in "All Systems No" and "The New (Para)Normal"; used on Molly McGee.)
Hailey's On It! (Heard once in "The Wild, Wild Mess"; used on Scott Denoga, and "The A-Maize-Ing Maze"; used on Hailey Banks.)
Star vs. the Forces of Evil (Heard once in "Star vs. Echo Creek"; used on Star Butterfly.)
The Tom and Jerry Show (Heard once in "Rosemary's Gravy"; used on Spike.)

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CooperCollinsTheAnimator
Gabe the Slacker (Used once for Molly's stomach in "Penelope & Her Friends Go To Disneyland" and for Zizi's stomach in "Penelope Brings Zizi Back".)
Sticky Steve - Official Channel