Definition of hootenanny noun from the Oxford Advanced Learner's Dictionary

 

hootenanny

 noun
noun
BrE BrE//ˈhuːtnæni//
 
; NAmE NAmE//ˈhuːtnæni//
 
(pl. hootenannies)(especially US English)
 
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an informal social event at which people play folk music, sing and sometimes dance Word Origin 1920s (originally US, denoting a gadget or ‘thingummy’): of unknown origin.
See the Oxford Advanced American Dictionary entry: hootenanny