Floyd Mayweather -- Bikini Spelling Debacle ... At Dallas Nightclub

The insanely hot bikini team at Medusa nightclub in Dallas was SUPPOSED to spell out Floyd Mayweather's name during his epic grand entrance this weekend.

Let's just say they fell short of a Vanya Shivashankar-like performance.

Don't worry ... they eventually figured it out ... and Mayweather went on to party his face off at the party thrown by Big D party promoters @themenofbusiness.

Plus, we're told Floyd -- in classic Mayweather form -- bought over 20 bottles of champagne for his TMT crew to sip on all night.

The buzz in the club was the Cowboys running back Joseph Randle was hanging out with Floyd in the VIP section ... along with Dallas Mavs player Bernard James ... and they all had a blast!