Iggy Azalea is stamping out a rumor that she's banging Tristan Thompson -- going so far as to say she's never met the dude ... not even once.
The Aussie rapper came out to address a report by blogger/YouTuber Tasha K ... who posted a new vlog this past week with the bold claim that Iggy has been sleeping with Tristan -- this amid other reports that Khloe Kardashian apparently wants him back (which she's denied).