jitterbug
n.— «The big holdup job gets messed up by a couple of “jitterbugs” who are assisting on it, the girl turns out a great disappointment, the gunman is rendered a fugitive with a moll and a dog who love him.» —“‘High Sierra’ at the Strand, Considers the Tragic Plight of the Last Gangster” by Bosley Growther New York Times Jan. 25, 1941. (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...
If someone urges you to spill the tea, they probably don’t want you tipping over a hot beverage. Originally, the tea here was the letter T, as in “truth.” To spill the T means to “pass along truthful information.” Plus...