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).
Thrash metal is also known as speed metal, and since many of the early thrash bands were from San Francisco, it became known as Bay Area Thrash. It started in the early to mid '80s and was at its peak in the late '80s. There was a strong east coast thrash scene as well, led by bands such as Anthrax and Overkill.