What's the deal with flatline?

So I've been off and on streaks since September. The most I've gotten to is 36 days. Maybe I haven't had a long enough streak, but I have never experienced a flatline. People talk about it as if it is the most horrible thing in the world and apparently it causes a lot of guys to PMO. From my understanding, flatlining is when all your sexual energy is gone. So if all your sexual energy is gone and you aren't getting any urges, why is it so difficult not to PMO? It seems like it would be easier. I'm kind of confused. Maybe it is something I have to experience to really understand it, but when I googled it, there was no answer that made sense to me.