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1.
The singular form of population or one person of a whole population
I am a populi in the sea of humanity
by Garrett M. Johnson February 22, 2008
 
2.
A stupid person who has no friends in his/her own state/country/anything.
Person 1:Hey what's your last name?

Person 2 : Populis
Person 1 : Aren't you the one with no real friends?
Person 2 : Yes! That is me!
Person 1 : Then go away.
by Unrealamigo August 14, 2011