The Ap-Sap is an item from Team Fortress 2 and is a Sapper replacement for the Spy. It replaces the default Sapper with a somewhat flattened Wheatley core. The Ap-Sap also has voice lines that are activated upon certain circumstances such as deploying a Sapper, death, or just idling.
The name of the item is a portmanteau of "Aperture" and "Sapper".
In the Team Fortress 2 description, it says that Mann Co. got a great deal with a nice lady at an underground research facility on a "warehouse full of slightly used, possibly mildly defective sappers.[sic]". The lady is likely GLaDOS, the underground research facility is Aperture Science and the slightly defective sappers could be a reference to the defective cores.[1]
