What comes to your mind wen a girl says she can be your half girlfriend?

So I just watched an Indian movie called "half girlfriend " where Riya (shraddah kapoor) said she can be Madhav (Arjun kapoor)'s half girlfriend and he didn't understand its meaning at all where he did something which spoiled their friendship
Guys, has any girl suggested being ur half girlfriend and did u understand what she meant
What comes to your mind wen a girl says she can be your half girlfriend?
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