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1.
When someone drops a college class before the end of the semester/quarter. Causes for premature dropjaculation are many, including: rigorousness of class, a dislike for the professor, or unforeseen obstacles. It is very rare for someone to make it through college without prematurely dropjaculating at least once.
Person 1: Hey, I don't see you in class anymore.
Person 2: Oh yeah, I prematurely dropjaculated.
Person 1: Man, don't worry about it. It happens to everyone at least once.
by Thecanuck March 20, 2011