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Coming from the RER subway in France where it is so packed everyone is squished so tightly together your rear is rubbing against someone else's junk.
A rerist is a creepy person, man, someone who "Rers" another person.
Nicole: "That man over there keeps licking his lips and winking at me!"

Corinne: "What a Rerist!! Don't look here!"
by Coreeeeezy. October 04, 2008
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