Talk:My Little Pony Equestria Girls/@comment-15629929-20130831160001/@comment-5513888-20130904025938

It's simply slang for a show that outlives its effectiveness. Ideas grow scarce, the effort wanes, and the quality declines. Good examples are Fairy Odd Parents and Spongebob.

See, if you watch anime you don't need to worry about this too much cuz most series are only 13-24 episodes long ;)