Kurt Warner's jaw is ALL JACKED UP -- and it's all because the 44-year-old took an ELBOW TO THE FACE!!!
It's unclear exactly how or why Warner got bashed in the mouth -- but it looks incredibly painful judging by the pics he posted to social media.
Warner says his jaw is broken in multiple places -- and the hit was so jarring, it separated his teeth.
We're working on details ... stay tuned.