When you are starting to wank but lose the motivation to reach the climax, therefore you push back delivering the results later hoping that it will feel better.
I was having a wank job while thinking of Anna Kendrick in "Up in the Air" but then I felt like I wanted to sleep a little more. So I stopped, slept 2-3 hours, then when I woke up, I restarted the job and I finally came. I procrasturbated.
I was rubbing my bean while thinking of being sanswiched by James Franco and Seth Rogen, but the idea of having Jonah Hill joining in just broke my momentum. So I stopped rubbing it before reaching any orgasm, watched some Sex in the City episodes for around 1-2 hours, then I restarted to finally squirt real hard while thinking of Brad Pitt. Procrasturbating sometimes give me bigger orgasms on the 2nd try.