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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.
by stefan April 10, 2005
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
to attack somebody physically and successfully
somebody fill in somebody, Please!

Craig David "I'm going to fill you in you bastard"

Avid Merrion "Arrgh....I've been filled in" (by Craig David)
by neilo5000 June 09, 2009
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3
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.
by dee eye zee May 24, 2005
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4
Slang for 'feeling'. Not 'feeling' in the context of feelin' on yo booty. Feeling as in "I feel like doing it today" or "I don't feel like doing that".
"I aint fillin it foo."
by TheKatWoman June 21, 2005
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