Fingerer's Remorse
The feeling you get when driving after realizing that the guy you just gave the finger will now be sitting alongside you at a very long traffic light or was heading to the same store. First used by Adam Carrolla on his podcast 1/16/2020.
I got a bad case of fingerer's remorse when I realized that the guy to whom I had just enthusiastically flipped the bird for cutting me off in traffic was pulling into the bosses space where I had come to interview for my dream job.