O tempora o mores!
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O tempora o mores! is a famous sentence by Cicero in his First Oration against Catiline, which means Oh what a time! Oh what customs!
In his opening speech against Catiline, who had previously tried to kill him, Cicero deplores the viciousness and corruption of his age.
This sentence is now used as an exclamation to criticize present-day attitudes and trends, often jokingly or ironically.