DJ Whoo Kid: I'm Rooting for Denver ... CAUSE OF WEEEEEED!!!

Two famous people in this clip ... one is HIIIIIGGHHHH ... and it's pretty damn hilarious.

Check out Plaxico Burress and DJ Whoo Kid leaving the Sirius XM offices in NYC Tuesday night -- talking about who they're rooting for in the Super Bowl.

But the best part is Whoo Kid -- who says he just smoked the "BIGGEST JOINT EVER" ... and it's heavily impacted his cheering decision.