Sounds like one person may not be too thrilled about Justin Timberlake's romantic reunion with Jessica Biel. Jessica's brother, Justin Biel, released a video trashing the 'In Time' actor, pop superstar and entrepreneur. But is there more to this beef than meets the eye? TMZ snagged the clip, which appears to be self-shot by Justin Biel. It's just him in a room with two bottles of 901 Silver Tequila on his desk -- and a whole lot of potty in his mouth.

"I'm coming to you live from corporate headquarters of 901 Siiiiiiiiilver Tequila," Biel says, "also referred to as my s----y one bedroom apartment," Biel says. Er, really? "Now you may have heard 901 Silver Tequila is the brand owned by Justin Timberlake. Yes, I am Jessica Biel's brother. Probably the only reason I got this f----n' job in the first place," Biel rants. At least he's somewhat in touch with reality, right?

"I've been waiting for [Timberlake] to do something with this f----ing brand," Biel growled. "Make a song about it, put it in a g--damn video, hold it up, take some pictures, I don't care... just do something because we're dying on the motherf---ing vine here!"

Biel makes sure that in addition to pointing fingers at causes to their problems, that he offers potential solutions as well. His ideas include starting a "motherf----ing rap career," beating people publicly with bottles and making a pornographic video in which he and his girlfriend are "guzzling bottles of 901 and throwing up all over the room."

Here's where things get both ironic and interesting. While it appears Biel is deliberately smack talking the brand publicly, a 901 rep spoke to TMZ and said they're in on the joke. "Justin Biel’s video was intended to be one in a series of videos created by 901 Tequila employees (including the brand owner) as part of a larger viral marketing campaign slated for the end of December," the rep said. "It was released prematurely without our knowledge and prior to the final edit.”

For his part, Biel claims via his Facebook page that he was just joshin'. "For all you knuckleheads that haven't figured it out. This is just a joke. hahah. Got ya," he wrote. In any case, the world sure knows more about 901 Tequila today than they did before. So in a bizarre, somewhat disturbing way -- it looks like the (alleged) campaign is working.

Watch Justin Biel Diss Justin Timberlake [NSFW]