A bop can be seen as a song with catchy or enjoyable lyrics and/or rhythm. “Bop” can also be used in multiple tenses to refer to someone/something being hit lightly.
Yo, this song is such a bop.
Damn bro, you see that white boy get bopped by Jayquan earlier? That boy looked like he was hurting for real. Weak ass, am I right?
Billy is a name; you may know someone with the name Billy. Billy is either smart or dumb, or maybe Billy is about the most boringly common person you know. In the end, Billy is Billy.