Actually the term originated from a tradition known “puhctèk”, the Latverians did this whilst in a ceremonial gown known as a “tankúp” which was a rough cloth shirt with a opening down the back. The main action of the traditional is pouring the puhctèk ,which was squashed tomatoes and oil onto the tankùp with your back to sun which of course because of the tomato would stain their neck red. The reason country folk are called this term is because of their association with sleeveless shirts which many call tank tops, and you may have noticed the term “tank top” sounds strikingly similar to “tankùp”.