我可以清楚的告诉你
[wŏ kĕ yĭ qīng chŭ de gào sù nĭ]
It means 'I can clearly tell you'. The owner of the nickname wants to show a confident self, that he or she can explain something very clearly without ambiguity. Alternatively, this name might suggest that the user speaks his mind straightforwardly and sincerely.