Rwanda
faire un coup d’état
“to stage a coup d'état”
Meaning
to steal someone's romantic partner
Elsewhere
piquer la copine de quelqu’un
Explanation
Standard French has no set phrase for it, only piquer la copine (or le copain) de quelqu'un. In Rwanda, Burkina Faso, Niger and Mali the rival stages a coup.
Example
Il m’a fait un coup d’état, il est parti avec ma copine.
He staged his own coup and ran off with my girlfriend.
Origin
Origin uncertain.
Where
Rwanda
Burkina Faso
Niger
Mali