In northern Nigeria many people who are not ethnic Hausas speak both Hausa and their own tribal language.
It basically uses English words mixed into Yoruban or Igbo grammar structures.
Pidgin originally evolved from the need for British sailors to find a way to communicate with local merchants.
Prior to colonization, these languages were the unifying languages of the southwest and southeast, respectively, regardless of ethnicity.
However, since the coming of the British and the introduction of mission schools in southern Nigeria, English has become the language common to most people in the area.
Today it is often used in ethnically mixed urban areas as a common form of communication among people who have not had formal education in English. Because there is little feeling of national unity among Nigeria's people, there is little in terms of national symbolism.