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Derived from low wattage light bulbs, a Low Watt is an exceptionally tight or miserly individual. Will never buy anything he can’t download, boil the kettle twice the same night or buy a round in the pub.

Never offers petrol money but will always be sure to collect it, goes out having “Forgotten” his wallet, expects family members to fix up his house and garden not just at a discounted rate, but completely free of charge.
Dave: "Tight bastard still hasn't weighed in with the cash for that job we did, Stan."

Stan: "We won't get that. That low watt wouldn't give you the steam off his piss!"
by UpYourKilt August 28, 2011
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Derived from the measurement of a light bulb's brightness, "Low Watt" is a term used for the dimwitted or used to describe dimwitted behavior.
"Kevin cover your fucking mouth when you sneeze you low watt motherfucker!"
by Brahbruhbro October 22, 2014
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