I just found out about this, apparently it's been in since 5.0. You can exclude up to two BGs from popping up in your Random Battleground queue from the honor menu. To do this, open up your PVP menu, and hover your mouse to the right of the battlegrounds you want to exclude, you'll know it's blacklisted when there's a thumbs down sign next to it. For me, I chose to exclude AV and IOC, the two bgs that horde almost never wins at. Your choice of blacklist won't work if the battleground is featured as the Call to Arms.