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Noun: yo-yo  'yow'yow
  1. A toy consisting of a spool that is reeled up and down on a string by motions of the hand
     
  2. [N. Amer] A stupid incompetent person
    - dimwit, nitwit, half-wit, doofus [N. Amer], noodle, simp [N. Amer], dufus [N. Amer]
     
  3. Something that fluctuates up and down or between extremes

Derived forms: yo-yos

Type of: plaything, simple, simpleton, toy

Encyclopedia: Yo-yo