Any time in which not wearing pants is socially acceptable. Usually takes place in the evening, with preference occurring after eight pm.
Is your room mate not wearing pants?

Yes, after all, it's No Pants O'Clock in our living room after eight.
by missiworld October 10, 2011
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1. The time between getting home from work and leaving for work the next morning. During this time an individual would remove his/her pants for superior comfort at home.

2. 5pm - 8am
I would invite you over, but it is pants-off-o'clock.
by mrwendal January 21, 2010
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