What does "duck" mean in the Urban slang dictionary ghetto street terminology?
Urban Dictionary has a rather large selection of definitions for Duck, some of them include: A contraction of Dumb Fk
A word in between D*mn and Fk
An undercover cop
An unattractive person
Someone easily influenced
Someone not informed about street life
Someone who talks too much
A person with no sense of style
The use that we've heard as most common is someone that's stupid, taking advantage of the alliteration of Dumb Duck, or Dumb as a Duck.