You filed online and shredded all your W2 after now you found out you need to send the w2 with 1040 what do you do?

File an extension.

Here is the form for extensions:

http://www.irs.gov/pub/irs-pdf/f4868.pdf

If you owe money, send the money with the extension.

Then go back to your employer and ask for another W-2. Then file your return.