Top Definition
n. An individual of either sex (though, let's face it, we're mostly talking about guys here) who truly believe they possess the illest car audio system in your nabe, and make a point of letting this be known to you and often as they deem necessary
Him: My car alarm went off! WTF!?

Me: Some megatwat just rolled by, setting it off...and every other car's on the block.
by BWB August 11, 2008
5 Words related to Megatwat

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