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Someone who switches lanes continually to try and make better time, especially in heavy traffic.
Passenger: "Stop switching lanes!"

Driver: "Yeah but that ones way faster"

Passenger: "Oh god your such a Lane Slut!"
by TheNickofTime January 27, 2010
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2
A driver who yields to everyone and let's them change into his/her lane.
The car in front of me was being a lane slut letting everyone on the "right turn only" lane change into his lane to go straight.
by namnomnom October 17, 2009
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