pendevolution 

The time frame of the pendulum like swing, of two or more species, in regards to one species ability to impact the life of another species.

Where the two species are birds and a flu virus. A virus may mutate so as to infect the birds until the birds develop an immunity or the virus changes. This process takes time to occur and the pendevolution is this time frame.

pendevolution by S Gibbons June 2, 2007

penivolution 

The evolution of penises in history, in which newest generation have bigger penises than older generation.

Friend 1: Have you noticed that old condoms had small sized packs?
Friend 2: “stoned” Yeah bruh, its the penivolution of penises in history. Thats why I have bigger dong than your uncle.

penivolution by TheStonedDude October 4, 2018