NY Post reports on the most annoying commercial of the year.OH...my...God...Becky. Guess what Target's new theme song is? It's none other than Sir Mix-A-Lot's ode to big booty," Baby Got Back," remixed for the back-to-school crowd as "Baby Got Backpack." It's ironic that a song that was once banished by MTV into the late evening because of fly girls shaking ...