Burping or Belching with nuts in your mouth. This extra effort provides bonus stimulation from the vibration and the rise of warm gasses that engulf the nuts. This creates a sort of "sack" around the "sack." In many countries, the addition of belching to the standard tea bag is considered a compliment to the person receiving the tea bag.
"I thought it was going to be just another boring blow job until I saw her chugging the Coke-a-cola. At that point I know I was in store for a Barking Tea Bag!"