An episode of a show where nothing of relevance is actually going on in the episode. Filler Episodes are usually made to keep viewers with content to watch while they think of new ideas and more time to make episodes relevant to the plot.
“I might stop watching this shit, there’s so many filler episodes.”
“Yeah I know right it’s actually ass.”
A 'filter episode' is an episode in a series that doesn't quite add anything to the storyline or have anything to do with the main plot. It is merely an episode that appears to be something to lengthen the series, or an episode that is used because the producers have run out of ideas and do not want the story to conclude just yet.
Example 1:
Jeff: "Dude, yesterdays episode was crap! It didn't even mention what happened last week!"
Ken: "Must've been a filter episode"
Example 2:
Stacey: "Ugh, another filter episode! When are they going to continue the story?!"