dammit operator

noun1

1. •
   (slang) The operator ! in the C# programming language, used to indicate to the compiler that a possibly null reference will not be null at that point.

   • However, C# 8 does have a feature (which I've heard referred to as the dammit operator) that allows you to insist that, despite what the compiler believes, you know the variable will not be null; […] — 2019