Lol. What is empirical evidence and why is it trending on Nigerian twitter?

So the word empirical evidence is the trending phrase in Nigeria now. This is after former Education minister, Mrs Oby Ezekwesili used it during her interview with Aljazeerah. Dr Ezekwesili had asked for empirical evidence when a question was put to her that her former boss Obasanjo's administration was a corrupt one. Trust Nigerians to make the phrase their own in the most hilarious manner. See the tweets after the cut...