[Lion]

I'm pretty sure UTG had TT+ or hit his set and thought you missed with like AK, AQ.

Button probably had KQ, KJ, AJ, or maybe he was good enough to fold lower PP like 55.

UTG+1 seems like a weak player disregarding the other callers, and not caring that he's out of position, so he probably had like KJ, KQ, QJ, hoping for a good flop, anything less than that, and he shouldn't be playing at 100NL.

Overall, if your impression of UTG is that he seems like a solid tight aggressive player, then give him credit for having you beat with trips or a fullhouse, otherwise he had any PP or even still trips/fully and wanted to get paid off.