A person or device that boots (starts up) a computer; also, slang for a computer hacker who launches denial-of-service attacks to knock systems offline.
'Boot' (to start a computer) + '-er' (one who does the action). The first sense dates to the 1980s-90s with personal computers; the second, darker sense emerged in the 1990s-2000s with cybercrime.
A 'booter' service is technically illegal—you can pay hackers to 'boot' your enemies' internet connection offline. It's darknet jargon that weaponized innocent tech terminology for harassment and crime.
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