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To give an actual answer, Monopoly in Catan allows the player who played the card to name a resource, and every other player must give all of that resource to the player who played the card. I imagine the OP negotiated using a specific resource, got what they wanted, then monopolied the traded cards back.
Ha I mean… It’s within the rules right?
Ye, I think his friends just regarded it as a dick move lol. Personally, I always enjoyed using the card later in the game when people start getting 2x resources every other roll.