The most awkward thing happened

I had just gotten some tacos and was sitting in my car sorting everything out before heading back home. I was really excited to eat my tacos since I haven’t eaten all day so I started singing this song I made off the top of my head. As I was singing I notice a man walk by looking at me but I continue singing anyways. I see him looking at me again so I stop and think oh my god he can hear me so I look away and start laughing and then I look back at him and he’s laughing. I don’t know if he actually heard me or if he thought I was flirting with him but if he heard me singing then I’m pretty embarrassed cause the song I made up was really weird lol