A person who is extremely knowledgeable about or (obsessively) interested in computer technology (especially the Internet), often regarded as lacking other interests or knowledge, socially inept, etc.
Origin
1990s; earliest use found in Business Week.
Definition of cybergeek in US English:
cybergeek
nounˈsʌɪbəɡiːk
slang
A person who is extremely knowledgeable about or (obsessively) interested in computer technology (especially the Internet), often regarded as lacking other interests or knowledge, socially inept, etc.