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Adjective: tongue-in-cheek  'túng-in,cheek
  1. Cleverly amusing in tone
    "tongue-in-cheek advice";
    - bantering, facetious
Adverb: tongue-in-cheek  'túng-in,cheek
  1. In a bantering fashion
    "he spoke to her tongue-in-cheek";
    - banteringly
     
  2. Not seriously
    "I meant it tongue-in-cheek";
    - facetiously, jokingly, kiddingly

See also: humorous, humourous [Brit, Cdn, non-standard]

Encyclopedia: Tongue-in-cheek