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...'.
Speaker: 'And that was it man, she told me it was fine for her to keep
packing dingers but that when I did it it was
just a sad effort to pretend I was back with the
boys...cmtsu'
Friend: 'cmtsu...'