Mud with a wet squirt or splat
Water bubbling getting gradually more gloopy and denser
Metal chip-frying basket into deep fryer with bang, large hiss and continuous bubbling sizzle.
Water bubbling from a rice cooker
Mud in a swamp with a fart
Bubbling underwater drone
Fast, manic bubbling: loud, close up, slowing a little towards the end
Water bubbling from a rice cooker thick and gummy