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Factsplain is when some smug know-it-all jumps in to explain something no one asked for, using fancy words that mean nothing, just to sound important and push their lefty agenda.
'You think the moon landing was fake? Let me explain it to you like you're a stupid child.'
DM: 'You're wrong, and I'm going to prove it with 100 sources.'
Tweet: 'Context is everything. You’re just a dumb conservative.'