When you have a randompremonition about your death and it causes you to make a drastic change in your actions.
Howie: "Whoa, check out that trailer hitched to that little Toyota pickup..it swerving everywhere!"
Jenn: "Can we speed up and get around it??"
Howie: "Why?"
Jenn: "I'm having a Final Destination Moment."
The act of messing around/flirting with a girl (or guy) simply because your bored or no one else worth messing with is around. The act occurs spur of the moment.
-Ey man, why was you messin' with her all yesterday?
-I dunno, sperm of the moment.
-Ohhh, I gotcha.
the moment or series of moments just before a person or person is utterly inihilated, literally or figureatively, and sees the cause of his destruction just before it kills him, and/or just after it is too late to do anything about it, and the most apt phrase for the moment is "OH SHIT";