I think our existence is just as evolution would suggest, to pass on our genetics and become the most efficient organism that we can.

Meaning of existence = eat carbs

Who says an atheist has no meaning for their existence? That is the false assumption of the narrow-minded theist.

Life has the meaning you choose to give it.

Why does everything have to have meaning? I highly recommend 'One Strange Rock' (miniseries on tv). It's a gorgeously shot, really interesting show, and a good reminder of how insignificant we really are, in the grand scheme of things...

No meaning other than to pass on your genes!

Well, I believe in a power greater than myself so I also believe that this power, or whoever is in charge of my soul development, has a reason for me to be here.To me, that is my sole intent in living this life..to expand my awareness and enable my soul to flourish. All I know for sure is love is the goal..for everything. And absolutely everything has meaning..including you.

I agree with Benthoven (level 7). Happiness comes from within. I read a book titled "Man's Search for Meaning" by Viktor Frankl. Viktor who is, or was, is a Jewish Holocaust survivor. He was also a psychiatrist when he was sent to the camps. He says the only reason to live is because you mean something to someone else. I think he started some kind of organization to help people find meaning in their lives (somewhere in Europe).
I think the Buddists get meaning from how a person navigates the obstacles faced during life. The mark of a good person is how well he/she endures adversity. This seems like a reasonable idea to me.
You know, I am proud of Christopher Hitchens (one of the 4 horsemen) who died of cancer. He stuck to his guns throughout the sickness and through death. (sorry, changed subject) (I can't spell).