The definition of bub is a slang term for a male friend.noun
An example of a bub is a teenage boy's name for his best friend.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Slang brother; boy; buddy: used in direct address
< Ger bube, boy
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Used as a term of familiar address, especially for a man or boy: See you around, bub.
Origin: Probably alteration and shortening of brother.