when you pull fat and dirty geebs. Its only considered a toc if the bottle is disgusting and the piece has never been cleaned. Only the biggest chillers can participate in a toc. Toc's are not for everybody and you should be nervous if you are invited to one for the first time.
Dude #1: YO bro, you want to go toc?
Dude #2: For sure boss, I have a bottle that I've been using for over a year. Its completely brown.
Dude #1: Nice man, my piece has given 3 people lung disease.
Dude #2: Wow, this will be a legendary toc sesh.