Moron/ˈmɔːrɑːn/ Definition 1 of 2Pro Tip 1/3Informal Insult Use 'moron' casually with friends, but be cautious—it may offend. Stop joking like a moron and be serious for a moment! Pro Tip 2/3Negative Emphasis 'Moron' adds strong negativity when criticizing someone's actions. You're not just wrong; you're a complete moron for thinking that. Pro Tip 3/3Sarcasm Trigger 'Moron' can indicate sarcasm when paired with unlikely praise. Nice job parking your car like a total moron!