Top definition
Some guy, usually at work, who's always providing information that you don't really want. Often, he prefaces it by saying, or writing, 'FYI'.
Ted: FYI, I'm just gonna go take a dump. But after I finish up in there, I'll be back.
Me: Thanks a lot, FYI Guy.
Me: Thanks a lot, FYI Guy.
by Circushead June 28, 2006