tongue-in-cheek
adjective /ˌtʌŋ ɪn ˈtʃiːk/
  /ˌtʌŋ ɪn ˈtʃiːk/
- not intended seriously; done or said as a joke
- a tongue-in-cheek remark
 - The magazine published a wonderful tongue-in-cheek review of his latest work.
 
Oxford Collocations DictionaryTongue-in-cheek is used with these nouns:- humour