I finally (sort of) understand was Fimbulwinter was talking about...

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What was he talking about?

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As I mentioned in my OP, I had raised several flops preciously (against an OOP lead bet) and gotten folds. So I didn't think I could represent much with a flop raise, and I didn't want him to call or reraise me off the best hand. So I called trying to represent a slowplayed overpair or flush draw + overcards (AK-AJs etc). I was planning on raising any turn card if he bet less than the pot. I probably should have made it 25, but 22 seemed just enough to get this guy to fold his better pair.

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Nice.