A filler friend is the one who is always walking behind the group when there's no room left or will often times be forgotten to be invited to events or gatherings. Usually ends up the designated driver when actually invited.
Jeff: "Hey man, that movie was badass!"
Eric: "Yeah dude, it was awesome!"
Tyler: "Oh.. you guys went to the movies last night?.." I'm so tired of being a filler friend..
by Poo Doctor October 27, 2015
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When someone that you barely know has no one they usually hangout with at a social event of some sort, and start acting like your friend.
by ...o.o October 27, 2010
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A friend who is used as a filler in social situations.

1. Having a party and inviting your filler friends just so there are more people, to make the party look more full.

2. Inviting a filler friend to a movie because you don't want to go alone.

"Hey I got an extra hockey ticket, ya wanna go with me?"
by Sarah Bunker October 26, 2008
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An acquaintance that you invite to important functions such as weddings and baby showers, but wouldn't normally hang out with otherwise. Like a carnation is a filler flower in a bouquet, the filler friend gives out the illusion that you have more friends than you actually do.
Since my fiance invited all of his hockey team to our wedding, I sent out an invitation to all of my filler friends so that I won't look like a loser with no friends at my wedding.
by Pixiegrrrrrl November 23, 2008
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