Ronda Rousey says WrestleMania is a "DO-OR-DIE MOMENT" for her ... that's how seriously the WWE superstar is taking her soon-to-be, history-making match.
TMZ Sports saw Rousey out in NYC on Thursday ... and asked her about the first ever all-female Mania main event against Becky Lynch and Charlotte Flair.
We also asked Ronda about her post-Mania plans ... 'cause there's been a lot of speculation from wrestling fans about Rousey's future -- but let's just say she's ultra-focused and pumped for WM.