Many rappers have successfully transitioned into acting careers; the reverse is rare. But that’s Simon Rex’s story: After parlaying his porn career into mainstream Hollywood, his character George from Scary Movie 3 has taken on a life of its own as tongue-in-cheek rapper Dirt Nasty. With Dirtay, Billy the Fridge, Ryan Caraveo, AK Romero, DJ Gerze. Neumos, 925 E. Pike St., 709-9442, neumos.com. 8 p.m. $13. MICHAEL F. BERRY