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1.
A random person who tags along with groups of people who he never usually interacts with. Occasionally he will speak up, and everyone in the group will look at him funny because no one is friends with him.

This term was created students 10 years ago to insult random people whose intrusive behavior resembled a science teacher named Mrs. Neff
There was this random neff Mendy's party the other night who started talking about how beer is bad.
by Mendy December 09, 2004
 
2.
Someone without rank or merit, deserving no real defining mark.
What a random neff that anus face is!
by Anus March 01, 2004