The Collaborative International Dictionary of English v.0.48:
Mick \Mick\, Mickey \Mickey\n. a person of Irish descent; -- an ethnic slur, offensive and disparaging. Syn: Paddy. [WordNet 1.5]WordNet (r) 3.0 (2006):
Mick n 1: (ethnic slur) offensive term for a person of Irish descent [syn: Paddy, Mick, Mickey]