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'.
Idiots submitting to Urban Dictionary without having the slightest grasp of the English Language, wherein spelling, sentence structure, grammar and rules of punctuation are flung down and danced upon. People way too stupid to be contributing anything in writing.
Did you read that ad he put on Doublelist? He is so UD Dum he can't even spell DTF!