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A person who drinks so much they forget how to breathe and just bong tokes like it's a job.
I saw my uncle at the bar and he was O. B. T. A. He drank 12 beers and tried to smoke a joint with a straw.
My friend's mom is O. B. T. A. She drinks wine and yells at the TV like it owes her money.
At the party, the guy next to me was O. B. T. A. He drank a whole bottle of vodka and started talking to the ceiling.