Definition of obstruction for English Language Learners. : something that blocks something else and makes it difficult for things to move through. : the condition of being blocked so that things cannot move through easily.
The Thrasher. 1. The Thrasher-is a hand gesture with a sexual connotation. The pointer finger and middle are pointing straight up while the thumb is bent like a hook. The ring and index fingers are kept in a fist and the back of the hand faces outwards (away from the gesture).
Four American bands, Anthrax, Megadeth, Metallica, and Slayer, are credited with popularizing the genre, earning them the title of the Big Four of Thrash. In Germany, Destruction, Kreator, Sodom, and Tankard, led the Teutonic thrash metal scene, garnering the nickname The Big Four of Teutonic Thrash.