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A loud annoying person who acts like a spoiled brat unless they're drunk out of their mind. They whine, make noise, and mess things up, but pass out when they get too wasted.
My cousin is a p. i. t. b. u. l. l. He won't stop complaining until he's drunk.
At the party, my neighbor was a p. i. t. b. u. l. l. He kept interrupting everyone.
My friend's dog is a p. i. t. b. u. l. l. It won't stop barking unless it gets a treat.