Cardi B's proving she's a ride or die for her man -- vehemently defending Stefon Diggs as he faces serious charges ... saying his former personal chef never accused the star WR of getting physical.
The support came amid a tense social media exchange on Monday ... when one user pointed out Diggs' charges stemming from allegations made by his ex-employee, who claimed he choked and slapped her over a salary dispute in early December.
Cardi was having none of it .