An individual who brings nothing to the table; someone who participates in a group function, while neglecting to exert any effort as far as contribution, but partakes in all the benefits from the contributions made by others.
Soon after the keg was tapped, Mike looked over and said 'Damn, here comes Justin. Talk about a non-contributing parasite'.
(short for contributing to society):
1)What everty warm-blooded college graduate/Silicon Valleyinhabitant (who can pay his rent), man, woman, and child should be doing;
2)the act of helping your fellow man;
3)giving positive input;
4)making life better for everyone;
5)tax evasion;
President elect: "Ya'll oughta cown-tree-bute!"
me/you: I contribute every year and every waking moment of my life which I personally strive to make as beneficial to men of all walks of life (avoid adding the obvious "especially the poor").