Top definition
A light found on some servers and computer equipment indicating a serious error or "fuck up".
Sysadmin 1: "OHHH SHIT, the fuck light's on on this server!"
Sysadmin 2: "FFFFFFFFFFFFFFFFFuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu....."
by John Walter Smith April 21, 2011
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