Living out your unaccomplished goals of being a sports superstar by forcing your children to play sports they are either too young to play or suck at playing.
I love Jim and Jenny to death, but little Timmy has no business being out on that field. This is a classic case of premature ejockulation.
Attempting to make a joke before all the key parts that are necessary to make the joke funny are there; often with the hope that the missing parts will form by the time they are required.
Person 1: That was uncool.
Person 2: What's uncool is your... ... um... damn, premature ejokulation.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.