You know you're a super hot chick when you can call a guy "fat ass" ... and minutes later, have him eating out of the palm of your hand -- something Rihanna has perfected to a T.
RiRi was bailing from Toxic at Lure Saturday night when she grilled our camera guy -- pun intended -- about his love for greasy food.
The best part ... just minutes later she apologizes and our photog is once again smitten.
You gotta watch, the video is hilarious.
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