The dawning realisation that you don't know what's going on in any given situation. Line from the 1980s Ultravox song 'Vienna':
Oh Vienna, this means nothing to me.
During the Q&A a professor asked an obscure question and as he was talking I was having a total Vienna moment.
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A Vienna Moment is a synonym for Bruh
A: „I fucked your mum“
B: „Such a Vienna moment“