Definition of humongous adjective from the Oxford Advanced Learner's Dictionary

 

humongous

 adjective
(also humungous)adjective
BrE BrE//hjuːˈmʌŋɡəs//
 
; NAmE NAmE//hjuːˈmʌŋɡəs//
 
(informal)
 
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very big synonym enormous Word Origin 1970s (originally US): possibly based on huge and monstrous, influenced by the stress pattern of stupendous.
See the Oxford Advanced American Dictionary entry: humongous