Ever wanted to know "what is the meaning of life?"?
Well, wonder no more.
Put simply, it is a grammatical aberration, a case of really bad syntax. Ask yourself "what is the meaning of sand" or "what is the meaning of tree" and you would realize how silly it is.
Whenever someone hears the question they automatically correct it into a valid question, such as:
For what purpose did god create life?
For what purpose was I born?
What purpose do living organisms serve?
Why was I born?
Why do living organisms exist?
and many many more. All of which have simple answers (which might differ between an atheist and a religious individual, as well as with your personal circumstances).
For example, "for what purpose was I born?" would be answered with "for no purpose at all" or "so that my parents will have someone to carry on their legacy" or "because my parents wanted to secure a US citizenship" or so on and so forth. But it is easily answered.