Folding KK preflop is probably the worst solution to this guys question. if not two unders or a pair, Ace under is the best situation you could ask for. nothing but a sick cooler, if kings were good from the flop, they were good the whole way. poor judgment on the flop and a bad turn check forced you into this cooler, a bet on the turn could have pushed you off led by his reraise or flat call for show of strength.