Tartle

Pronounced, “tar-tul”. A Scottish term that describes the anxiousness and hesitation to greet or speak to someone whose name one has forgotten. It is also the moment of panic when one is introducing someone else and realises they have forgotten that person’s name.

Reference:
Goldstein, D. G., & Gigerenzer, G. (2002). Models of ecological rationality: The recognition heuristic. Psychological Review, 109(1), 75–90. https://doi.org/10.1037/0033-295X.109.1.75

The Newsroom. (2015, July 2). Scottish word of the week: Tartle. https://www.scotsman.com/arts-and-culture/scottish-word-week-tartle-1500914