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."
by PRAISE THE LAWD January 20, 2016
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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
by manateefactgurl October 13, 2023
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