PHD Flopper is a perk in Call of Duty Zombies mode that protects players from self-inflicted explosive damage and allows them to kill zombies with a dolphin dive explosive shockwave.
Step-by-step explanation:
PHD Flopper is a perk in the Call of Duty Zombies mode, specifically seen in Call of Duty: Black Ops and Call of Duty: Black Ops II Zombies. This perk provides players with two main benefits: it negates self-inflicted explosive damage, allowing players to use explosive weapons without the risk of harming themselves, and it causes players to create an explosive shockwave when they perform a dolphin dive onto a group of zombies, which can kill or damage nearby zombies.