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Blub is a nickname to call a loved one such as a girlfriend/boyfriend. It can also be used to address a person/animal that is related to you, cute, chubby, or lethargic.

There are only two true blubs in the world though.
Hey blub, I love you.
You are such a blub
Look at that little blub
by Blubathan March 07, 2010
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The slang term for blubber, used because it sounds better, and is more pleasing to say
"Awwww....that walrus has cute blub..."
by Andrew Baines February 01, 2006
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A blub is the German pet name for a water bong, due to the noise it makes as the chronic passes through the water. Also known as a Blubber or a Blubbi.
The bong went blub, blub, blub then he looked up at her through bloodshot eyes and said ooooooh yeah!
by Blub2k January 11, 2005
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The blackest and one of the most versatile words in the human vocabulary, Blub is a term used to define anything which is untasteful. It can be used to describe a state of being or a single thought or emotion. However, it is not a word that can be accurately put to use as an insult, for example, Calling someone "A blub" or anything else defining blub as a singular object is completely innacurate, as blub truly is in and of itself.
It is a word that should only be used in the most vile and dire of circumstances.
Person 1: "How's it going today?"
Person 2: "Blub."
-or-
Person 1: "I'm so sorry. Your mother has passed away."
Person 2: "...Blub."
by Feengorrz August 31, 2008
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A word used when no other word will do; sometimes used as an exclamation
1. Blub! The fire engine's red!
2. Blub...I dropped my pocket.
by Krazy K October 19, 2003
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