Bad: Tracy Morgan says he farted on Kate Upton once.
Worse: He's pretty sure she smelled it.
Awesome: HE DOESN'T GIVE A CRAP WHO KNOWS!!
Morgan broke the ... uh .. news ... while taking part in a Reddit AMA Thursday ... after someone asked, "who is the most famous person you have farted around that you are definitely sure smelled it?"
Morgan immediately replied, "Kate Upton."
We did some digging on when the crop-dusting could've gone down ... and our best guess is when they got together back in January so Tracy could teach her a Super Bowl endzone dance.