Similar in nature to a Mexican Minute, it indicates a lack of urgency or a tendency to show up at ones own leisure, with little regard for others time.
Nick arranged a game of FIFA to start at 9:35pm, however didn't show up untl 9:50. The length of time that passed before he showed up is a McIlwain Minute.
by Scottiro May 05, 2010
1 more definition
A period of time falling between a Mexican Minute (about 5 minutes) and a Jones Minute (about half an hour).
Nick came up with the idea of meeting at the bar at 6:45, but he was a McIlwain Minute late, even though he lived a minute away.
by TenaciousDenny May 06, 2010