2. To thrash a car is to drive it harshly & disrespectfuly
3. To thrash an opponent in a competition is to win by a large margin
4. To thrash a woman is to penetrate her forcefully, with your penis or otherwise
5. A genre of short fast and loud music
2. I thrashed my parents' car when they were on holiday.
3. We'll thrash ya in tonight's game!
4. See that blondie over there? Thrashed her last night ay.
5. Oi, i feel like headbanging, put that Slayer album on.
Thrash began in the early 80s; depending on who you ask, the first thrash band was Metallica, Exodus, Overkill or even Venom. Thrash is best enjoyed by headbanging or moshing.
East Coast thrash: Anthrax, Overkill
German thrash: Kreator, Sodom, Destruction
Modern thrash: The Haunted, Dew Scented -OR- Toxic Holocaust, Hypnosia (differing schools of thought)