Dimrah

That moment during a concert just before the main act takes stage—typically after a several-minute intermission—where the lights suddenly dim, indicating that something is about to happen, and so the crowd immediately erupts into applause.

The word is an onomatopoeia, combining the word “dim” with the sound of a large crowd all shouting in unison, which sounds kind of like “raaah”. That is, it is the dim of the lights followed by the “rah” of the crowd. The Dimrah

“Man I really gotta piss, but I don’t want to miss the dimrah!”