sea potato

A fat ass manatee. Like so fat Honey Boo Boo's mom would tell it to eat a salad.

Could also be a swimming McDonalds customer.

"What is that? A Godzilla sized shit?"
"Nah man, that's a fucking sea potato. It's probably binge watching Netflix and crying into a pillow right now."

Sea mower potato

It’s a manatee - Did you know they eat the grass in the ocean?! Now ya do.

Thanks to the sea mower potato’s, I was able to spot more shells while snorkeling