I'm glad you asked because I'm wondering the same. I thought it meant a character would do something considered uncouth and or shocking, not just for shock value but because the action would made make him/her feel better (despite deliberately upsetting or making everyone else uncomfortable). However, it's been used in so many different ways, I honestly decided to hold off using it until this all get sorted out.
^ That's... not the trope at all.
RIA has nothing to do with making the perpetrator feel better. It's basically taking the opposite tack from Getting Crap Past the Radar for the same ultimate goal: get away with something that wouldn't otherwise fly with The Man(tm).
People in general tend to overlook things that are so ridiculously over-the-top because they can't (or don't want to) accept the notion that what they saw happen actually did happen, due to it being so beyond any sense of reason, logic, or expectations of a given scenario.
Sorry! -embarrassed- I just came here from reading that page and noticed a link at the top I have never seen before. I was a little surprised.
Well... I guess I want to help. Though I don't think someone like me with no editing skills and short attention span would do much.