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Definition of Luser
1. Noun. (computing slang derogatory) A person who does not have the ability to use computers. ¹
2. Noun. (computing slang derogatory) A user (especially in IRC) who disobeys the rules of the servers that he or she is using and usually resorts to disruptive or offensive behavior/behaviour. ¹
¹ Source: wiktionary.com