✔ 最佳答案
There are a lot of possible meanings. One of the best is:
1.BTS
Burning Tonkomong Sensation. Tonkomong meaning butthole in Korean. Usually means that they have diarhea. Used when you tell someone that they have BTS when they run to the restroom.
Hey look at him running in the restroom...he must have BTS.
You can check out all the possibilites here:
http://www.urbandictionary.com/define.php?term=bts