Steven Tyler -- I'll Play the Bongo ... You Watch My Schlongo

TMZ CHALLENGE!!!!

See if you can watch this video of a mankini-sportin' Steven Tyler bangin' away in a drum circle in Maui ... and NOT stare at his drumstick.

Impossible, right????!

Anyway, we obtained this incredible footage of the Aerosmith singer layin' down a beat during one of those hippy drum circles usually reserved for Venice Beach ... or Matt McConaughey's house.

Word on the street is ... the hot chick in the background is Tyler's rebound chick ... which sorta makes sense since there have been reports he broke up with fiancee Erin Brady.