Wow what an existential question! Well I would say – with a straight face – that the meaning of (our human) life is, really, “to find out the meaning of life”! Everyone has different life experiences which lead to different conclusions! But it is most important is that everyone should try to live their lives to the fullest regardless of the circumstances.
This is a philosophical rather than neuroscience question. I personally don’t think there is any purpose to our existence, humans exist as they are via a combination of fluke mutations and evolutionary pressures. Life doesn’t have a meaning it just is!