This is short for "taking a Raymond Burr", which means "a non-handicapped person taking a JDub in the handicapped stall". The name comes from the legendary actor Raymond Burr, who was not handicapped at all, but played "Ironsides" on TV; a detective confined to a wheelchair.
"I'm headed off to take a RayBurr" or "A RayBurr is in FULL EFFECT as we speak!"
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