does whatever he/she wants
He only does what he wants.
He always does whatever he wants!
— The Garden of Sinners, film 5 : Spirale contradictoire (2008)
Même mort, il n'en fait qu'à sa tête.
Even dead, he still does as he pleases.
— L'Échine du diable (2001)
Il sort de prison, il n'en fait qu'à sa tête.
He gets out of prison and does whatever he wants.
— Toni Erdmann (2016)
She only does what she wants.
Mais le conducteur n'en fait qu'à sa tête.
But the driver just does whatever he wants.
— Le Chant de la mer (2014)