coup de main - noun
kü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Watch: Billie Eilish vs. UK Slang.

Poor Billie Eilish was seriously confused by Vevo UK in the making of the below interview, during which they attempted to teach her some UK slang.

Watch the interview segment below...

P.S. Order the Billie x CDM Zine #6 here.