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People or persons who have no meaning in this world, they have a boring personality, and they are rather dull. People who are outgoing are usually not fill-ins.
Michael jackson is the perfect example of someone who is not a fill-in.
fill-in by stefan April 10, 2005
Refers to an act of grafitti art. To use two or more spraycan colors to fill-in an outline of text on public property.
Did you end up going out to graff last night?

Yea, I did a fill-in under the bridge, you should check it out.
fill-in by dee eye zee May 27, 2005

Fill in the beaks 

the act of “insert action” to poachy smalls, it can mean a variety of things so long as it’s applying to the beak aka “poachy”

Ie, to fulfill a task with Poachy or complete an assignment with the aid of poachy/ receiving her help to complete a task

To “fill in the beaks” is , well, TO FILL IN THE BEAKS !
I be blastin that ass like a beak
Make ya poach squeak

Help me clap them cheeks
So I can fill in the beaks

Guy 1: man I gotta finish that philosophy exam, I better fill in the beaks

*calls a chicken over the phone*

“If you are to pass that test you best fill in the beaks”

Without the beak one cannot fill in the beaks
Fill in the beaks by Gibbygeo February 11, 2022

Fill-in-the-blank-istan 

One of a dozen ex-Soviet satellite countries of western and southwestern Asia.
Out of all the Fill-in-the-blank-istans, Afghanistan is the most beautiful, especially the snow-capped Hindu Kush mountains.

(fill-in-the-blank)-gate 

When there is a personal or work controversy, just add "gate" at the end to dramatize it, similar to Janet Jackson's boob-gate during the Super Bowl.
I'm sorry about (fill-in-the-blank)-gate today at our meeting. I don't know why everyone had to make comments about you. It was entirely inappropriate.
(fill-in-the-blank)-gate by C-Dubs November 20, 2007

fill-in friend 

A person who is a friend, only when your other friends are not present.

Also referred to as a "number two". Any social networking site has a Top Friends, and the number is your next best friend.
"Well, John isn't here, so I guess I'll have to talk to my fill-in friend."

"Amy had to go to the concert, so I guess it's just me and the number two."