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A person who is emotionally clingy.
See also:
A bag of hurt. ‘Hurting’.
People who will invite themselves to an event or who hang around where they aren’t wanted.
A cat who constantly whines for food even though it’s full. A dog who cries at the door waiting for its master to come home. A guy who cries over an ex he broke up with.
I heard a similar, possibly Polish, term: “sour heart”.
Possibly derived from some random Star Trek episode which featured the phrase “ugly bag of mostly water”. This would be “ugly bag of mostly hurt”.

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