In football, the term "baiting" refers to a player fooling an opponent into making the wrong play. Baiting can happen in almost any positional matchup on the field, but it is most commonly associated with a cornerback baiting a quarterback on passing plays.
A defensive back can bait a quarterback into throwing a pass that can be intercepted or well-defended by giving the wide receiver a bit of space in coverage. This makes it look like the wide receiver is open when in reality the defensive back is in a great position to make a play on the ball.
Baiting can be a dangerous strategy for both teams. If the defensive back gives up too much space or misjudges his ability to get to the ball, the outcome can be disastrous for the defense. Of course, the quarterback making an ill-advised throw to his wide receiver can have even worse consequences in the form of an interception.