Word of the day: (and an example of the sorts of questions librarians get asked)

barbotage
A method of spinal anaesthesia in which a portion of the anaesthetic solution is injected into the cerebral spinal fluid, which is then aspirated back into the syringe and reinjected.

Origin: Fr. Barboter, to dabble

From: CancerWEB's On-line Medical Dictionary

It shows up in French websites discussing the use of a shaker and cognac, so I guess it's used in making mixed drinks, too. :)