What does Call of Duty series mean?

Call of Duty series meaning in Urban Dictionary

The (metaphorically) funniest joke in the world! A casino game show that goes from MW1 (which was a pretty sick game) to MW2 (which included pictures that blew everybody else away but had awful game play with campers/OMA noobtubers/hackers/glitchers/and boosters) to Ebony Ops (which is the most recent online game when you look at the series that ironically has the worst pictures yet but good action!) It is metophorically a tale as the games go from bad to worse and people believe it is nonetheless a great online game (ironically those that tend to be ruining it)