Manny Pacquiao -- Bloody Trunks Sell for $40k ... at Charity Auction

The bloody boxing trunks Manny Pacquiao wore during his victory over Timothy Bradley this weekend have sold at a charity auction for a cool $40,000 ... TMZ Sports has learned.

After the April 12th fight, Manny decided to donate his shorts, gloves and other boxing memorabilia -- to help raise money for the victims of January's super typhoon in the Philippines.

The auction went down at the Beverly Hills estate of Victorino Noval -- where entry into the party ran $1,000 per head.

A rep for the event confirms the blood-stained shorts -- a result of the headbutt in Manny's fight with Bradley -- were bought by a private bidder for $40k. The identity of the winner has not been released.

As for the rest of the guests, they definitely got their money's worth -- when Manny grabbed the mic and belted out a version of "Still" by the group Hillsong United.

Enjoy!