Unfortunately your responsible for what's done on your account. Its your responsibility to keep your account safe and prevent things like this from happening.
Edit: I suggest contacting Meat because he sent the money via PayPal, so it should be fairly easy to get back and this issue can be resolved.
I know its my responsibility ,, but sometime its unexpected .. and on top of that its PAYPAL .. easily reversible option .. i tried to contact "MEAT" but he/she not replied yet .. may be he/she already reversed his money !!