Acidcat is a character seen in flashback in the series The Good Place. He is a DJ who wears a giant cartoon cat's head when he performs.
Jason Mendoza once gave Acidcat a demo of his own EDM, which Acidcat dismissed as terrible, but offered Jason the opportunity to wear the cat's head and stand in for him while he went to a party. Jason grabbed the opportunity, only to then mess it up by playing his own music instead of Acidcat's.
Acidcat may be a play off of popular DJ and EDM producer Deadmau5.