I've been watching some episodes of Poker After Dark (the tournament episodes) and heard the dealer say that if the players try to straddle, it will be considered a "dead raise". But what exactly is that? I can't seem to find this term defined anywhere.
When you straddle in the traditional sense in a poker room that allows them, it's considered a "live" straddle. Several popular variations of straddling exist, but one common element is that they're "live." This means that the straddler is paying for the privilege of acting last in the pre-flop round of betting. If the dealer in your example is saying that it's a "dead" raise, that simply means that the bet is not a live straddle but rather just a bet placed blindly that doesn't confer any additional benefits.
It's when the UTG player posts an additional blind and thus is given the chance to act last. This action is not considered a raise to the rest of the table.
From what I have heard , a "Dead Raise" its when you raise without any change to get the pot. You trying to bluff your hand its sure they will pay.