Someone who does stupid shit so often, they somehow become proficient at doing it well
Stan is a professional dumbass, he keeps getting himself out of stupid situations
by Garlic S August 26, 2020
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Someone so stupid it’s a profession for them
You see John over there?

He thinks that’s it’s fun to eat rocks and stick things up people’s ass.

This is a professional dumbass
by Professional Dumbass February 10, 2021
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