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

 

oompah

 noun
noun
BrE BrE//ˈʊmpɑː//
 
; NAmE NAmE//ˈʊmpɑː//
 
; BrE BrE//ˈuːmpɑː//
 
; NAmE NAmE//ˈuːmpɑː//
 
(also oompah-pah)(informal)
 
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used to refer to the sound produced by a group of brass instruments an oompah band Word Origin late 19th cent.: imitative.
See the Oxford Advanced American Dictionary entry: oompah