Ariana Biermann Mortified After Mom Kim Zolciak Implied Ex Kroy Died

Ariana Biermann is cringing hard after her mom, Kim Zolciak, implied her estranged husband, Kroy Biermann, had died ... and yeah, we'll admit, it's pretty embarrassing. For those who missed it, the 'Real Housewives of Atlanta' alum posted an old…