1. Clyde says:

    Also a term for large hoop earrings popular in the late eighties.  See Notorious B.I.G. ‘Gimme the loot’: “…and when I rock her and drop her I’m taking her door knockers…”

  2. John C. Reed says:

    also used in the Southern US for unusually large nipples on a woman…not to be confused with “knockers” which refer of course to the entire nipple support system…

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