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A time where the chance for action (usually, but not always, sexual in nature) arises. When one sees such a chance, one must grab it (or, if you will, jump through the window of opportunity).
1. The Sexual Window of Opportunity. . .
Where one comes across a girl drinking a pint, and casually slips her a tab of rohypnol, thus creating a window of opportunity for easy sex later.

2. The non-Sexual Window of Opportunity. . .
Where one sees and old lady struggling with heavy shopping, the window of opportunity arises to help her. Remove a baguette, whack her over the head, and take her purse and sausages.
by Jeffrey Douglas January 27, 2007
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