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You say this when you realize you just made a complete fool of yourself, and you’re too proud to admit it, so you pretend you were being deep.
'I'll let you ponder over that one' after I said the moon was made of expired pizza.
'I'll let you ponder over that one' when I tried to explain why my dog is a philosopher.
'I'll let you ponder over that one' after I told my teacher I was doing homework on a different planet.