What is Ping Ping Stain?
The act of smearing poo on a girl's cheek after or before you have ATM'd her. The stain should be discreetly wiped on a nearby pillow to evade the victim's knowledge of such stain. Named after the lovely Ping Ping who was thankfully unaware of said occurence.
After I finished the anal birding of that ho I couldn't help but leave a little Ping Ping Stain on her cheek before she finished me off.