Top Definition
carpool lane, HOV lane.
Cali. coll. early 90's
A refrence to the symbol painted on the roadway a diomand to show that the lane is designated to carpoolers (cars with more than 2 or 3 people).
hey, get into the diomand lane! we dont nee to wait in traffic we are carpooling.
by Brion December 09, 2004
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