wieso machst du

why do you

→ wieso
phrase Rare #31,330
why do you Used to ask why someone is doing something. It is usually followed by an object or another phrase, such as „Wieso machst du das?“ (Why do you do that?). „Wieso“ is interchangeable with „warum“ in this context.
GE: Wieso machst du heute so früh Schluss?
EN: Why are you finishing so early today?

Wieso machst du dich schick?

Why are you dressing up?

— Wenn die Kraniche ziehen (1957)

He, wieso machst du das Fenster nicht zu?

Hey, why don't you close the window?

— Suspiria - In den Krallen des Bösen (1977)

Wieso machst du dir denn Sorgen um mich, Enjou?

Why are you worried about me, Enjou?

— The Garden of Sinners: Paradoxe Helix (2008)

Wieso machst du das?

Why are you doing that?

Wieso machst du's nicht?

Why don't you do it?

Wieso machst du dann mit?

Then why are you participating?

— Oh Boy (2012)

Wieso machst du so was?

Why are you doing something like that?

— Shoplifters - Familienbande (2018)