[popularized by Johnny Hart's comic strip B.C.: but the word apparently predates that]
1. To clear the state of a wedged device and restart it. More severe than ‘to frob’ (sense 2).
2. [TMRC] To cut, sever, smash, or similarly disable.
3. The sound made by many 3.5-inch diskette drives. In particular, the microfloppies on a Commodore Amiga go “grink, gronk”.