The meaning of life....there was a topic on this a while back, and I was very happy with my answer there

However, my room is roasting, the air conditioning is on the fritz, so for the moment the meaning of life is to stay cool

So I can't be bothered looking for where that thread was
To be honest...I don't believe I need any 'meaning' to justify my existance...however, if there is some purpose to it, then I still hold that the meaning of life is simply to live it; if you spend all your time worrying about the hows and the whys, then you simply won't give yourself a chance to enjoy it.
I believe you only have one chance at existance...when you're time is up, you can't simply press the reset button and start again, so it's up to all of us to get the best out of it