"Wehrmacht den sowas" is a saying that is often used in German slang and can be applied to different situations. He often expresses astonishment, astonishment or incomprehension. The expression can be used humorously as well as slightly ironically.
Person A: "You know, I heard that the new restaurant is supposed to be very expensive."
Person B: "Really? Wehrmacht den sowas? Then I'd rather go to my favorite place."