Dikembe Mutombo Hilariously Shames Singing Camera Guy

Word to the wise ... DON'T ask Dikembe Mutombo to sing ... and DON'T try to duet with him on the street ... 'cause it'll lead you down a path that ends in ... FINGER WAVE HUMILIATION.

Mount Mutombo was out in NYC when one of our more adventurous camera guys asked him if he'd ever use that legendary bass voice to kick off a singing career.

Check out the clip -- the question was met with the same result Dikembe gave almost every basketball player in the '90s ... a vicious rejection ... followed by the dreaded Mutombo finger wave.