I meannn is used to say, like duhhhh.
Guy: you want to get food
Girl: I meannnn
Usually paired with a confused expression a head tilt and is usually spoken in a higher tone than your usual voice - I mean signifies that you do not believe what someone is saying, do not care, don't agree or I meann can be used to change the subject
Person 1: look how attractive he is omg
Person 2: *confused expression* *head tilt* *high pitched voice* I meannn
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