Watt
what
A colloquial expression, especially northern German, for 'was' (what) or 'was für ein' (what a/what kind of). It is often used in questions or exclamations to express surprise or disbelief.
Watt für ein Durcheinander!
What a mess!

what
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what
A colloquial expression, especially northern German, for 'was' (what) or 'was für ein' (what a/what kind of). It is often used in questions or exclamations to express surprise or disbelief.
Watt für ein Durcheinander!
What a mess!

The word 'Watt' (what) is strongly colloquial and is used mainly in northern Germany. In formal situations or in other regions of Germany, it should be avoided.
Watt willst du denn hier?
What do you want here?
'Watt' (what) is used especially often in exclamations following the pattern 'Watt für ein/eine ...!' to express surprise. It corresponds to the standard German form 'Was für ein/eine ...!' (What a ...!).
Watt für ein tolles Auto!
What a great car!
Besides exclamations, 'Watt' (what) can also be used as a simple question word in very informal conversations. It then replaces the word 'was' (what).
Watt hast du gesagt? Ich habe dich nicht verstanden.
What did you say? I didn’t understand you.