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Definition:
"PC28" is a term used in informal language to describe someone who behaves inappropriately or with poor manners. This term was popularized during the 90s and has become a slang term for those who have not developed a certain level of maturity, or who behave in ways that are considered inappropriate.
Example Sentence: "Hey, I heard you're PC28 over at the party. Nice clothes, but your manners are just so off-putting."