bluebird
n.— «That actually was a bit of a blue bird, I’d have to say.…They had actually as a customer been dormant for some time. And then apparently their business must have started picking up because all of a sudden they came back and wanted quite a bit of product. And so last quarter we had a—what I would call a catch up quarter, and I would not expect the ongoing business to be at the same level.» —“Q1 2003 California Micro Devices Earnings Conference Call – Final” FD (Fair Disclosure) Wire July 25, 2002. (source: Double-Tongued Dictionary)
Further reading
Secret signals on the job: Waitresses at some 19th-century restaurants ensured speedy drink service by communicating with a non-verbal code. One server took orders, then placed each customer’s cup to indicate exactly what the customer wanted...
Mike in Ukiah, California, grew up in the UK, where he often heard the expression to know your onions, meaning “to be knowledgeable about something.” He suspects the phrase is rhyming slang, but It’s most likely one of many...