First, "Ghetto Gaggers" is a term I remember from a TV show called "Mob Wives," which was about women in the mob. So, that's about organized crime, probably in the context of that show. Then "Mahogany" might refer to a specific gang or a nickname for a group. "Mp4" is a video file format, so maybe it's a video related to the group. The %21%21TOP%21%21 is just URL encoding for "!!!TOP!!!", indicating it's a top video.