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):

Mickey
    n 1: (ethnic slur) offensive term for a person of Irish descent
         [syn: Paddy, Mick, Mickey]

The Jargon File (version 4.4.7, 29 Dec 2003):

mickey
 n.

    The resolution unit of mouse movement. It has been suggested that the
    disney will become a benchmark unit for animation graphics performance.


The Free On-line Dictionary of Computing (30 December 2018):

mickey

    The unit of resolution of mouse movement.

   It has been suggested that the "disney" will become a
   benchmark unit for animation graphics performance.

   [Jargon File]

   (1999-06-30)