Oh yeah, kinda forgot about that one

Location: Philly
Time: Late Saturday night this past June
Basic Breakdown of Story: I was hanging out with a bunch of people, friends of friends of friends, and some black guy had used the word 'piggly-wiggly' in a sentence. I was unaware of the term, so after he was done his story, I asked, "What does 'piggly-wiggly' mean?"
A guy standing next to me says, "What did you just say?" and I repeat the question to him. He becomes pretty vehement, starts yelling and cursing at me, right in my face. I hadn't been in a fight in a long time, and I knew that he was drunk, so I just stood there and listened to him get all worked up, not too worried about what would happen next.
All the people standing around me thought I had done something wrong, but regardless, they pulled the guy away before it came down to blows. I explained myself a million times, saying that I didn't know what I had asked him, and they explained to me that 'piggly-wiggly' is a term for a cop, and that's what the guy does for a living.
Eventually everyone came to understand that when I asked the question, I had really meant what I said; it was a really hard concept for them to grasp. Apparently, if you meet someone from Philly, don't try to explain to them that you might have a different cultural upbringing than them, as it's a concept too difficult to digest.
Either way, the guy came back, reamed me out a little, told me about all the crap he has to put up with in his job. Again, I tried to explain that I was genuinely just wondering what the word meant, but I could tell that everything I said wasn't attainable for him, so I just shut up and let him do his drunk thing. His friends carted him off shortly afterward, apologizing profusely for his drunken state and desire to fight me.

The rest of that night people continued to talk about how I almost got in a fight because I asked an off-duty cop what 'piggly-wiggly' meant. I didn't think it was a big deal; the guy had been drinking a lot, and some drunk people would fight a butterfly if they stumbled into it. The thing that really pissed me off was that the guy who had originally said the word 'piggly-wiggly' kept on giving me a hard time for asking about it, which didn't make sense at all, because he's the one who had originally used it, knowing full well what it meant.

The story just popped back into my head today. Not sure how I'd forgotten about it in the first place. Even more unsure why I thought about it.