bub (n.)

"a woman's breast," 1860, short for bubby.

bub (n.1)

also bubby, familiar address for males, 1839, perhaps a variation of bud "a little boy" (1848), American English colloquial; perhaps from German bube "boy." But sometimes, along with bud, assumed to be a corruption of brother (compare buddy, bubba).

bub (n.2)

"strong drink of any kind," especially malt liquor, 1670s, perhaps imitative of the sound of drinking.

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