Semi-related: Do other countries have fragments of speech used as filler such as "like" and "you know"?
Semi-related: Do other countries have fragments of speech used as filler such as "like" and "you know"?
I firmly believe all countries do this.
Also there's a one-to-one relationship between english's use of "like" as a filler by our use of "genre". In this case, "genre" means "similar to". So one could say "J'ai genre... mangé une criss de grosse poutine" in the same way an english speaker would say "I have like.. eaten a fucking huge cheese-and-gravy covered bowl of french-fries".
It's really telling of how religion has been removed from French culture during the Revolution.
In the South it's "noo", and it vaguely means "why don't you?". Or "allore", from Italian allora.
It is nonetheless grammatically possible to contrive every sentence to end in "desu." This is an unusual habit, though. It's a little like beginning every utterance in English with "it seems" or "Simon says."
Some context: http://knowyourmeme.com/memes/desu
If you want filler, it's when people are going え~と while trying to collect their thoughts.