(The “Shaka” is apparently the new “Fingers crossed behind the back.”)

Not that we’re totally surprised by it, considering his history of playing the blame game, but it looks like BJ Penn has switched from feeling sorry for himself after announcing his retirement following his UFC 137 decision loss to Nick Diaz to making excuses why he lost the fight.

Penn randomly today tweeted the following at Diaz, who is preparing for his Super Bowl weekend UFC welterweight interim title fight with Carlos Condit in a few weeks.

“@nickdiaz209 Look how much bigger you are in this pic..” he wrote, referring to the photo above. “I thought you were gonna scrap from the beginning homie? What was that coward fence holding strategy to tire out the smaller man? Street fighter my ass! I made you fight like glass jaw @jonfitchdotnet poser! I’ll be ready for that weak bs next time we fight!”

(“Phew…They didn’t catch me.”)

When word got out yesterday that Thiago Silva gave the Nevada State Athletic Commission a non-human urine sample following his UFC 125 win over Brandon Vera in January, everyone expected the American Top Team fighter to follow in the footsteps of predecessors like Josh Barnett, Royce Gracie and Sean Sherk and deny any wrongdoing.

Well, in spite of his attempt at skirting NSAC rules, Silva has proven himself to be a bigger man than they are (and no, we’re not talking about the commission’s recent claim that it will be hiring a professional hogwatcher) by admitting he screwed up.

In a statement he sent MMAJunkie today, Silva admits that he tampered with the test by using a “urine adulterant,” meaning a chemical compound that cases dirty urine to register a false negative reading when tested. There are several products on the marked that claim to beat drug tests and even “clean” synthetic urine that can be purchased online for such purposes.

Before we get into a pissing contest about who knows more about the science of beating urine tests, check out Silva’s explanation after the jump.

("This isn’t going to end well, I can feel it.")

 Well, the Chael Sonnen PED case just got a whole lot stranger.

According to a report by Sports Illustrated’s Josh Gross, Sonnen indicated to California State Athletic Commission officials who administered his pre-fight drug screening urinalysis that he had taken a banned substance that might show up in the test.

That’s pretty much the nail in the coffin of his UFC career if true, but Chael being Chael will likely blame it on this guy with the Hispanic accent who has been impersonating him in interviews:

(Pic props: lookoutawhale via the UG)