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habwubwubwub is when you get so soft in the gut from looking at something cute that you start drooling and whispering sweet nonsense to it.
I saw a puppy and did a full habwubwubwub in the middle of the mall.
My coworker did a habwubwubwub over a baby duck and cried like a baby.
I did a habwubwubwub to my cat and then fed it three times.