1 definition by MarkHanley

Top Definition
OSM
Oh Shit Moment
1. The point of realization that you forgot to do something important.
2. The point in time of a discovery that you forgot a step in assembly or development process when you realize you forgot an earlier step.
3. A moment of surprise occurring when some new information is discovered that provides a negative or detrimental result in an otherwise wonderful event.
Ricky had still another OSM when he discovered the hole in the condom he used last night.
by MarkHanley August 12, 2004

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