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1.
Twat lamps are bright lights on a car (usually located under the headlights) that are turned on to signal to other road users that the occupant has difficulty applying a strict interpretation of traffic laws. Very occasionally also used for extra visibility during fog.

Also known as twat lanterns.
There were so many boy racers heading towards us that I was blinded by all the twat lamps
by fatmarrow November 19, 2010
 
2.
the best insult ever
derived from e-lamp
ure such a twatlamp asdfasfasdf
by akgsjlgasdkg January 15, 2008