A detogatory name to call someone who's annoying or who you dislike at the moment. This term is usually used for comedic reasons. The word thur(THOOR)roll your r's means (poop) in the Indian language Malayalam and the word bucket just adds to the disgustingness.
Person 1: Hey i hate you
Person 2: That's mean, you THUR-bucket!
Person 1: That is mean...hugz?
Person 1&2: *HUGS*