It's a Perk-A-Cola.
PhD Flopper is a Perk-a-Cola featured in the game mode Zombies. It was introduced along with Stamin-Up on the map Ascension. It returns in Call of the Dead, Shangri-La and Moon.
The perk costs 2000 points to buy and it has a dark blue and purple color scheme. PhD Flopper completely negates self-inflicted damage; however, the player will still groan and suffer temporary movement reduction when falling down from an elevated area. Another feature of this perk is that when players dive to prone from a height from which they normally would take fall damage, a 7.5 meter radius mini-nuke is created on landing.
The "nuke" is very powerful, with a maximum of 5000 damage at the center of the blast radius, and can kill zombies with one hit up to approximately round 20. Between rounds 20-30, PhD Flopper will begin to make crawlers, and on rounds beyond 30, zombies will retain their legs even in the center of the blast. The perk is made from Prunes and some types of chemicals. A good strategy for using PhD Flopper to its best effect on Ascension is to just buy it early on and then keep diving to prone near where the perk machine is found. By doing this it is possible to get to round 20 with minimal use of ammunition. However, as this is an explosive "weapon", it should be noted that the player only receives 50 points from each kill, when opposed to the 60 points that are acquired by using a bullet firing weapon, so using a gun would be advised if the player is going to buy something, such as other perks. This perk though doesn't seem to work when diving right on top of multiple zombies. It should also be noted when "Flopping" that landing on a prone player while diving to prone will cause both players to be downed instantly, so one should avoid other teammates while diving.
PhD Flopper made its first appearance in Call of Duty: Black Ops on the Zombie map Ascension, which you can buy on Black Ops from the First Strike Map Pack for 1200 Microsoft Points. Along with PhD Flopper, Stamin-Up made its first appearance in Ascension.
No, all the trolls out there will say it is possible. It is NOT possible to get PHD flopper on Die Rise. Source: Common Sense
Stay by flopper and if you are solo "circle jerk" which is running around the lander pad at flopper and shoot when you have enough space. Thunder guns are the best for this
PHD Flopper and Stamin-up
The PhD flopper is a power up on Ascension and Call of the Dead that makes you take no fall damage and if you run jump and crouch it makes an explosion that kills zombies
Run the zombies in a circle around the lander near PhD Flopper, and use PhD when possible to conserve ammo.
juggernog, speed cola, quick revive, mule kick, double tap rootbeer, stamin up, phd flopper, deadshot,
it depend sif your playing black ops zombies or world at war zombies black op zombies has stamin up double tap and PhD flopper regular world at war zombies has speed cola jugger nog and quick revive
theres a perk called PhD flopper its purple only on ascension and call of the dead ascension its near the lander by the grenades and mp5k on cotd its i guess u would say beside the lighthouse
Flopper
black coffee has a pH of 5
I have black ops and MW3 but I find MW3 to be better but you do get bored of it as you do with black ops but I recommend MW3 but black ops is fine.