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

Watch: Vince Staples + Kendrick Lamar perform 'Yeah Right' together at Coachella.

Kendrick Lamar made a surprise appearance at the end of Vince Staples' Coachella 2018 Weekend 1 set tonight, joining him on-stage for 'Yeah Right' and to deliver his verse.

Watch the performance below...