From Tapestries MUCK
The dictionary says "Synonyms: harass, harry, hound, badger, pester, plague. Harass and harry imply systematic persecution by besieging with repeated annoyances, threats, or demands. Hound suggests unrelenting pursuit to gain a desired end. To badger is to nag or tease persistently. To pester is to inflict a succession of petty annoyances." The term is a bit more broad on a muck, as a single incident of such, if extreme enough, can be considered harassment.
See also: Policy Harassment