Professional sponge Lil Twist is in trouble again. Only this time it doesn't involve any of Justin Bieber's cars (for a change) -- just his house. Or rather, something that happened therein.

TMZ reports the Biebs' BFF is named on a police report accusing him of battery. According to the alleged female victim, she was at Justin's crib around 3AM this morning, and when she tried to leave, Twist "grabbed her by the arm in a forceful manner" to keep her from doing so.

She was able to shake him off anyway and apparently drove straight to the sheriff's department to file a complaint. Cops are investigating, and Justin was reportedly not home when the incident took place. (He's been a little busy lately getting tossed from nightclubs and dodging iPhones anyway.)

No word from Twist about all this, but as many times as he's acted a fool on, in and around Bieber's property -- including a DUI just last month in the 'Baby' singer's chromed out Fisker Karma -- he's probably learned it's best to just keep his mouth shut.