Can anyone explain to me what "热闹的嬉笑怒骂外加弹唱小曲" means?
嬉笑怒骂 is a common expression

嬉笑 (playfully laugh); 怒骂 (angrily scold)

嬉笑怒骂 means "to ridicule" (ironically and/ or bluntly )

[热闹的][嬉笑怒骂][外加][弹唱小曲]

[lively][ridicule][plus extra][playing of little song]

"弹唱小曲 (play little song)" -- "sing song about it" is the third way of ridiculing beside "playfully laugh" and "angrily scold"


  "热闹的嬉笑怒骂外加弹唱小曲” means: " lively ridicule every which way and more"