Top Definition
Pronounced: Sei Bye

Can You Believe It
CYBI that he voted Republican?
by joeretro January 27, 2009
Noun. A person who is sexually responsive to both sexes; ambisexual, but only in cyberspace (a.k.a. online). This person isn't necessarily bi-sexual in their everyday life because they may not have ever or will ever have a physical, sexual experience with a person of their same sex. A cy-bisexual person uses the virtual world to act out their relationship fantasies even though they may never act on them offline.
Jesse is Cy-Bi (cy-bisexual) because he has a boyfriend online, but he's never dated a guy in person or been with a guy physically.
by Marajade208 January 14, 2015

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