An enragement ring is a piece of jewelry, typically a ring that is purchased for a girlfriend in an effort to make her happy after you have made her angry.
Boyfriends are likely to make their girlfriends angry all the time. Apparently oral apologies are not sincere enough. Thus buying their girlfriends an enragement ring, a gift that they couldn’t resist, would distract their attention and make them happy while help boys pull through. However, a ring might not be enough if the boy made a huge mistake.
A: Wow, your girlfriend is pretty pissed that you were out all night and didn't call her. What are you going to do?
B: Yeah, you're right, she's pretty mad. I might have to buy her an 'enragement ring' to smooth things over.