Dennis Rodman's World Cup Message -- GET FIRED UP for USA vs. Belgium!!!!! (??) (VIDEO)

Dennis Rodman is SUPER EXCITED to watch USA vs. Belgium ... in fact, he's so amped for the big game, he made a WWE-style pump-up video ... and TMZ Sports has the footage.

Just watch ... and remember this key piece of Rodman advice:

"UNITED WE STAND ... PROBIDED WE FALL."