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 7, 2010
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 1, 2006
The American fish goes blub blub, the French fish goes bloob blub, the Black fish goes Blub Blub Mother F*cker.
I stared deep into Goldy's pitch-black eyes and from the moment he said "blub" I knew we were ment to be.
by Clobothehobo November 12, 2006
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
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