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Definition of frat boy noun from the Oxford Advanced Learner's Dictionary

frat boy

noun
 
/ˈfræt bɔɪ/
 
/ˈfræt bɔɪ/
(North American English, informal)
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  1. a young man who behaves in a loud or stupid way, considered typical of members of some college fraternities (= clubs for male college students in the US)
    • a teen comedy about a group of party-loving frat boys in 1950s Florida
    • frat-boy humour
trait
noun
 
 
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Oxford 5000
B2
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