Your tax return has been received and is being processed? what does it mean?

To answer your question, "What it means when it says online that your tax return has been received and is being processed?": This means that the IRS or the Internal Revenue Service or IRS has received your tax return document and they will be processing it. Getting the refund will take 21 days and will be updated after 24 hours when you have submitted it online and 4 weeks when you mail it.