The inspiration of the brilliant The Meaning of Liff series was that “it seemed a waste to have words cluttering up signposts when they could be usefully attached to something namelessly familiar”. Two related definitions:

Gallipoli. Of the behaviour of a bottom lip trying to spill out mouthwash after an injection at the dentist. Hence, loose, floppy, useless.

Ljubljana. What people say to the dentist on the way out.

See also More vocab for the dentist’s.