Person 1: What's a black hole?
Person 2: Black holes are...um...they're uh...black holes, they...erm...er...
Person 1: You have no fucking clue, do you? You're just using filler words now.
A (generally) teen-age boy who spends the majority of his time masturbating into a tube sock. Sock fillers tend to be socially awkward, often standing slack-jawed while in the presence of their female classmates.
"As the girls' P.E. class ran past, a large number of sock fillers began to shift uncomfortably and mumble to each other."
A colleague who you can share a beer with after work, but would not invite to your home. Usually an occupier of time before one meets their real friends.
Q: Do you want to meet for dinner at 8pm by your office?
A: That's okay, I'll hang out with a folleague until then.
When a band releases an album where there's only a couple good songs, and they need more to make a whole album, so they make crappy songs knowing they aren't that great just to complete the CD since you need at least around 8 songs for a good CD.
The Shins' new album "Wincing the Night Away" has only a few great songs on it, and around 15 tunes in total, so they make a bunch of album fillers in order to make it a full-length album