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An acronym frequent in the parlance of those in the greater Philadelphia region to represent 'can't make this shit up'. In typical discourse, one interlocutor concludes a story of an interaction with someone of absurdly illogical yet stubbornly self-justified behavior by whispering on an exhale 'cmtsu...'. In standard call and response fashion, his fellow interlocutor will respond in sympathetic affirmation 'cmtsu...'.
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