say what?
US /seɪ wʌt/
UK /seɪ wʌt/

1.
was sagst du?, wie bitte?
used to express surprise or to ask someone to repeat something because you did not hear or understand it
:
•
I just won the lottery! Say what?
Ich habe gerade im Lotto gewonnen! Was sagst du?
•
You want me to work on Saturday? Say what?
Du willst, dass ich am Samstag arbeite? Was sagst du?