Fun Police

図書館から借りる本の間に読むThe Answer by Allan & Barbara Peaseを読んでいます。
A typical loser's bad habit list usually includes:
Letting people get under their skin
Procrastinating
...
Being the Fun Police
Being in a job they hate.
"Fun Police" の意味がさっぱり分かりません。普通の辞書には説明は見当たりませんでしたか、次の俗語辞典の意味で使われていると思います。
・Urban Dictionary: Person or group of people who make others stop having fun for whatever reason, usually out of jealousy or spite, but sometimes because said fun is against the law.