Definition of moon verb from the Oxford Advanced Learner's Dictionary

 

moon

 verb
verb
BrE BrE//muːn//
 
; NAmE NAmE//muːn//
 
Verb Forms present simple I / you / we / they moon
BrE BrE//muːn//
 
; NAmE NAmE//muːn//
 
he / she / it moons
BrE BrE//muːnz//
 
; NAmE NAmE//muːnz//
 
past simple mooned
BrE BrE//muːnd//
 
; NAmE NAmE//muːnd//
 
past participle mooned
BrE BrE//muːnd//
 
; NAmE NAmE//muːnd//
 
-ing form mooning
BrE BrE//ˈmuːnɪŋ//
 
; NAmE NAmE//ˈmuːnɪŋ//
 
 
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[intransitive] (informal) to show your bottom to people in a public place as a joke or an insult Word Origin Old English mōna, of Germanic origin; related to Dutch maan and German Mond, also to month, from an Indo-European root shared by Latin mensis and Greek mēn ‘month’, and also Latin metiri ‘to measure’ (the moon being used to measure time). Phrasal Verbsmoon aboutmoon over somebody
See the Oxford Advanced American Dictionary entry: moon