The act of foreseeing oneself making a woman orgasm using only the tip of one's nose, and then making it happen in reality, much like the predictions of a prophet.
Dude 1: How did your date with Sally go?
Dude 2: That was a total Nostragasmus night! I totally got her off with only my nose. Just like I said would happen.
Dude 1: That's some prophetic, biblical shit.
Dude 2: And then my staff parted her seas.