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....."
The glowing portion of an enemy in a video game (usually a boss), indicating a weak or vulnerable area.
Every boss in starfox(tm) has a fuck-me-light.
When a fuck boy sets the mood lighting for the night.
By the time we walked in, he already had the fuck boy lights on and everything.
Allowing someone who is shining his/her high beams in your rear window to pass so that you may in turn shine your high beams in his rear window.
I was on the highway and some jerk was blinding me with his high beams. So, I let him pass and I light fucked him.
When you are driving and someone decides go way under the speed limit, so rather than flash your high beams, you turn on your off-road lights/light bar to blind them.
High beams don't count, they MUST be off-road lights!
Some jackass was doing 45 in a 60 on the highway, so I turned on my "Fuck You" Lights and burned out their retinas.