On a moving vehicle, an unused turn signal.
That guy's been driving with his idiot light on for 6 blocks.
by C. Michael June 16, 2008
a light used to announce a malfunction in a system, especially in a automobile
That idiot light goes on over the smallest things.
by The Return of Light Joker March 28, 2010
Lights on the dashboard of a car indicating an action must be taken for continual operation of the vehicle; most commonly the low gas light.
Oh man, I need to get gas because the idiot light just came on.
by waitejo June 11, 2012
A derisive term for warning lights in a car dashboard or any similar arrangement in a vehicle's cockpit. So called because they light up when the operator is being an idiot and letting something go wrong.
Check Engine, Oil Pressure, Battery...all idiot lights that won't switch off. I need a new car.
by Airrider October 10, 2009
An indicator light or illuminated signal, usually colored red, yellow, or orange, on a vehicle dashboard intended to convey a condition of which the driver should be aware. Most frequently, it indicates a system malfunction or a potentially dangerous condition (e.g., low oil pressure, high coolant temperature). It may be a word or words ("Charge"; "Check Engine") or a symbol which may or may not be readily identifiable.

The derisive term comes from the fact that such lights typically take the place of a gauge, meter or other indicator that can provide more substantive and detailed information. The binary (on/off) nature of the light is considered inferior to an indicator which provides data on the condition, but which requires some interpretive thought by the operator.)
"Get the manual out of the glove box so I can look-up what that idiot light that just came on means."
by Wordsquire March 19, 2014
The green coloured indicator on a motorcycle. Which informs the rider, they are in the "Neutral" gear, when lit.
"Dude...Why's my bike not moving?"

"Of COURSE it's not moving, STUPID! Your 'idiot light' is on!"
by D. Gould January 27, 2006
When you have a stick shift car and the little light on the dash comes on. Idiot light
Jay is driving down the road and the idiot light comes on, Shift idiot!
by Mara Dream June 16, 2008

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