Padonk
The loud, meaty splash of a huge turd hitting the toilet like a cannonball. You know it's coming when you hear that 'padonk' followed by a cold water surprise.
He let one rip and the padonk echoed through the whole house.
I heard a padonk so loud, I thought the toilet was on fire.
She didn’t even flush, just let it drop with a big old padonk.