The Game got on his soap box at his birthday party ... grabbing the mic and telling the world to free Diddy and R. Kelly ... and then he started talking baby oil and urination ... and it's all on video.

TMZ obtained footage from The Game's Friday night birthday bash in Hollywood, and you hear him voice support for a couple of infamous musicians ... Diddy and Kelly. Play video content

The Game gets bolder and bolder as he spouts off into the mic ... making light of all the baby oil and urination aspects of the Diddy and Kelly trials ... as some R. Kelly music starts to play.

He then adds ... "Free all the freaky homies!!!" Play video content

Seems like The Game was having a helluva night ... other videos from the same club show him smoking and dancing with his friends.

Didd

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