It is a word that should only be used in the most vile and dire of circumstances.
Person 2: "Blub."
Person 1: "I'm so sorry. Your mother has passed away."
Person 2: "...Blub."
Person 2: 'We could hit the blub'
Person 1: 'That's a terrible idea. I'm sleepy. I'm going'
Person 2: ''kay'
Person 3: 'I'm just here to get drunk no matter where'
There are only two true blubs in the world though.
You are such a blub
Look at that little blub