1. an informal name used to address someone out of affection; usually a significant other; beloved or loved one
2. a person or thing that one loves and/or unconditionally, romantically, and selflessly
3. someone highly cared for by someone who loves them
4. an admirer, a boyfriend/girlfriend, loved/beloved, wife/husband
Girl to her friend: My babu is taking me out on a date tonight to the movies. :-)
Boy to his friend: I love my babu, and we are getting married soon!!
Girl to Boy: I would do anything for you, Babu!
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