Play video content EXCLUSIVE DECEMBER 2015 TMZSports.com

16 hours before the Milwaukee Bucks crapped the bed and lost to the last place Lakers -- several Bucks players hit an L.A. strip club and partied until 2 AM ... and TMZ Sports has the footage.

O.J. Mayo, Greg Monroe, Khris Middleton and Miles Plumlee rolled into Ace of Diamonds L.A. on Monday night ... and we're told they stayed a little after 2 AM.

The Bucks played the woefully bad Lakers on Tuesday night and lost -- just days after upsetting the previously undefeated Golden State Warriors -- leaving many people scratching their heads.