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1.
A person who offers lifts in their car to two or more of the opposite sex for sexual favours, but does not obtain them in the end. (Run-X-A)
Dude did you see that car full of chicks being driven by that guy? He's going to be thinking he's a Runxa in the morning!

guy in the morning: "Man I got Runxed last night"
by 8pidi January 31, 2009