Definition from Wiktionary, the free dictionary
thrasher (plural thrashers)
- One who thrashes.
- Any of several New World passerine songbirds, of the genera Toxostoma, Allenia, Margarops, Oreoscoptes and Ramphocinclus in the family Mimidae, that have a long, downward-curved beak.
- A thresher shark.
- (informal) A fan of thrash metal music.
one who thrashes