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Used as a term of familiar address, especially for a man or boy: See you around, bub.
[Probably alteration and shortening of brother.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. informal Also called: bubba US fellow; youngster: used as a form of address
a. a baby
b. bubs grade the first grade of schooling; nursery school
[C20: perhaps from German Bube boy]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(used as an often insolent term of address) brother; buddy.
[1830–40, Amer.; perhaps < German Bub, short for Bube boy]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.