Definition of boy exclamation from the Oxford Advanced Learner's Dictionary



BrE BrE//bɔɪ//
; NAmE NAmE//bɔɪ//
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(informal, especially North American English) used to express feelings of surprise, pleasure, pain, etc. Boy, it sure is hot! Oh boy! That's great! Boy, it hurts! Boy, am I glad to see you! They eat it for breakfast and boy is it good! Word OriginMiddle English (denoting a male servant): of unknown origin.
See the Oxford Advanced American Dictionary entry: boy