From ibikeu Wiki

Habitual opponents of proposed rides, events, or changes in behavior, or anything else. Naysayers are most prominent in forums like the Midnight Ridazz forums. An alternative use is as a term to describe those opposing a specific proposal. A third use is to describe someone who acts in a way or says something that is not F.U.N.. While there are several meanings, often a person will meet all these criteria, so in many situations the meaning is unambiguous. In all cases, Naysayers are the opposite of Yaysayers or Sayers (disputed).