A chargeback is when you sell something to someone via a method such as PayPal, then it normally occurs when someone (the buyer) wants their money back and PayPal won't help them.. they then "double dip" and try to get their credit card company (that they used to make the paypal payment) to issue a refund for the payment they made via PayPal... There are lots of possible ways that people do this, but it always involves a Credit Card and an unhappy or fraudulent buyer trying to get their credit card to issue a refund directly if the seller will not...