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n. A day that comes every so often during high school physical education classes, in which the P.E. teacher leaves the equipment room unlocked and has his assistant take attendance, leaving the class to its own devices as he sits in his office with the door locked looking at porn for an hour and a half.
Q: Why can't you use the computer in the gym teacher's office?

A: The keyboard is still sticky from open gym.
by Rick Scales June 26, 2004
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