A potato thumb is a person you can't decipher whether they look like a potato or a thumb. Someone who's very existence annoys you, because you just cant put you finger (or thumb) on what object they most resemble. You can't be friends or date a potato thumb without the constant need to address the resemblance making them completely undesirable.
I don't know if Beto is ugly or just a potato thumb.

There's nothing worse than a potato thumb trying to hit on me at the club.

Why is your potato thumb ass still talking?
by Ydnim November 12, 2018
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