I saw this phrase many times on Twitter. But, I don't know the exact usage or meaning this phrase portrays. Can anyone please enlighten me with the definition you think is accurate! Thanks in advance!
This phrase is due to the popularity of a card game designed by the online cartoonist known as "The Oatmeal - the game is called "Exploding Kittens" and is now commonly played in households with children from just pre-teen through teen ages - some young adults have also adopted this game.
Potato Cat is a specific category of card in this game, which is intrinsically useless on its own, having no specific ability or action assigned to it; however, when assembled with other Potato Cat cards, can be used to demand a card from another player's hand. I'd guess half the reason this is used in the context of photos is visual...