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When one arm is a lot darker in shade than the other because of the effects of sun. Caused by one arm constantly hanging out of the car window.
#1 "Hey you look weird. Why is one arm so dark and one white?"

#2 "I suffer from reps arm because I drive a lot"

#1 "Then you need to lie on that side all the time on your holiday mate!"
by migrosmarket June 27, 2013
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