An example of a bad beat is when you are way ahead in a hand going into the river, and the odds
of getting beat are less than %5 - Lets say QQ vs JJ, and there's a jack on the river.
A Cooler is when you get beat while you are trips or better. Say you are in the big blinds, and you want to fold because only have 5-8o, yet everybody limps in and the only thing you can do is call.
the flop is 6-7-9 and you want to go all in, but you are out of position and the cut-off person beats you to it.
You helplessly sit and watch as the board pairs up on the river. giving the cut-off person a full boat 'cuz they went all-in with 3-of a-kind after the flop.