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familiar address for males, 1839, perhaps a variation of bud "a little boy" (1848), American English colloquial; perhaps from German bube "boy," or from English brother.
A woman's breasts; boob2 (1900s+)
A man; fellow; brother; guy •Used in direct address, with a slightly insulting intent: Okay, bub, get the hell outta my way
[1830s+; fr bubba fr brother]