What is a bad beat, really?

[JackTensuited]

Definitional question about a term that is used ad nauseam in poker circles... I'm curious to know what precisely people mean when they call something a "bad beat"?

Is it a bad beat when any hand that is behind ends up ahead at the end of the hand due to a lucky draw?
OR does your opponent have to make an INCORRECT or BAD play and get lucky with a draw to beat you?


How about this hand?

You have A [img]/images/graemlins/diamond.gif[/img] A [img]/images/graemlins/spade.gif[/img].
Opponent has A [img]/images/graemlins/club.gif[/img] K [img]/images/graemlins/club.gif[/img].
Flop comes A [img]/images/graemlins/heart.gif[/img] T [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/club.gif[/img]. Turn is T [img]/images/graemlins/diamond.gif[/img]. River is Q [img]/images/graemlins/club.gif[/img].

Bad beat?

Thanks.