I finally figured out the Bloopy answer. As I said, I'm basically atheist and I don't think there's any inherent meaning to the universe, at least not one we can discover. So meaning as I know it is something created by the brain. At every level, the brain interprets signals to make sense of them, from hearing a simple humming sound, to feeling a complex mood based on a variety of factors. Following that train of thought, the meaning of life would be something like the overarching interpretation that arises when one ponders life as a whole.
So when I meditate on the entirety of existence and life as we know it, what sense does my mind make of it? That it's everything. It's tragic, it's entertaining, it's venerable or absurd, overwhelming or underwhelming, serendipitous or zemblanitous, it's like being inside a computer or labyrinth, it's a toy to play with, it's like being a slave to events beyond your control yet having the freedom to do anything within the bounds of physics and/or society, it's a chance to leave a legacy or even
try to leave no trace at all. The meaning of life is the infinity of possibilities. Once I worked that out then I realised other friends had said the same basic thing in different words, including my ex who considers this meaning a core part of her identity. Funny knowing the Bloopy answer was already right in front of me since 6 years ago.
Philosophers get caught up on separating out different definitions of "meaning", particularly 'purpose' vs 'making sense of'. However, I think purpose is just more layers of interpretation. If someone finds a strong purpose, that helps them fill in the details of how existence makes sense to them. Or in my case I can take what sense I've made of life and ponder some ideas on top of that for my brain to conjure up a purpose.
I realise I may have a bit of a non-answer here. What it is is that it's possible, because if it wasn't, nothing would be...
The meaning of life is to seek and love the meaning of life as you discover and define it.
This line is even more of a non-answer given it's a circular definition. You go searching and discover the meaning of life is to go searching and discover the meaning of life, finding that it's to go searching and discover the...
Also, re: science, "how life works" & why it all exists are two very different questions. Sure, a scientist is most likely happy contributing to society, but an explanation for why that's the 'meaning of life' would still very much up to philosophy. Not merely a matter of presenting the scientist's work. More scientists might say the beauty is that we don't know the 'why' and leave it at that.