Depends on the situation. If you flopped a miracle full house with rags, its a very vulnerable hand. Someone with a big pair could turn or river a bigger full house on you. Now, if you flopped a full house with AQ, (AAQ) thats something you WANT to slowplay, get someone holding JT or KJ to make a straight on the turn, and then you can trap them. Lets say you flopped the nut flush, in late position, and theres action. Would you want to slowplay here? Depends on what you put the bettor on. If you think the bettor flopped a set, you will need to pound on him right there... make him pay to draw to his 10 outs. If you think he flopped two pair or worse, you can definitely slowplay here. The odds
of the turn and river hurting you are very slim. Again, slowplaying is very situational, and depends on where you're at. To the original poster, Checking your trip jacks on the flop is relatively safe, but letting two cards pass can potentially be dangerous. What if someone picked up a redraw on the turn card (as evidenced by the straight draw picked up by who won that pot) and got there for free on the river? You needed to bet that turn, and hard to have picked up what is a small pot. You'll know not to do that next time I suppose.