The bulk update request #12485 has been approved by @evazion.
deprecate boss
Ambiguous tag - currently seems to be a mix of bosses of jobs/companies, canon tagged video game boss characters, and a few pieces depicting boss battles in action. Corporate bosses could be moved to something like boss_(company) if it's even worth tagging as a concept, while things like post #5345564, post #5303961, and post #5233585 could get a boss battle tag.