Used in the context of general equities.
General: Customer is firm on price and has set the price(s) at which he wishes to transact the security . Thus, the trader is not attempting to "properly" price the trade or get one side a better price.
Missing a print: "Customer has asked us to" print to satisfy " because he has missed a print."
O.T.C. : "Stock is trading away due to a customer asking for better prices."
Swap : "Customer has selected the prices to be used in executing a swap."