houses of ill fame; a place where the sex trade or prostitution occurs

the process of crowdsourcing information about a person or event online; often leads to doxing or public exposure of individuals

(Internet slang) a large-scale collective effort by netizens to track down information about a person or event; crowdsourced investigation or doxxing

A person used as a target for physical practice or as a vent for someone's anger; literally using a human body as a sandbag for boxing practice.