Twink rotating is a complex method for twinks to run battlegrounds with regular players that have their experience turned on. It requires at lease two separate accounts, each having a twink. With one twink, you would queue for a battleground and join. Once the battleground is filled, you would then queue for that specific battleground with your second twink. You then play the battleground normally with you first twink. Before your team captures the enemy flag, you leave the battleground. This in turn, makes a slot open for your second twink to join.
Failure to leave the battleground before capping the flag will result in gaining experience, which twinks do not want. It is ideal for pvp guilds since a guild mate can verify if the flag was capped or not before joining the battleground with your second twink.