DAG act
A guy and his guitar who think they're rock stars. They sing like they’ve never heard a real band before.
My cousin did the DAG act at my birthday. He screamed so loud, the neighbors called the cops.
She tried to do the DAG act at the coffee shop. The barista asked if she was auditioning for a talent show or a screaming match.
He did the DAG act in the lobby of the hotel. The manager asked him to leave or start a karaoke night.