When having anal sex with two girls at the same time with your unwashed, smelly member. At the moment of orgasm, you pull out and have the second girl swallow your filthy load.
If you ever perform the Dirty Sturgeon with a couple a good looking girls, be careful of kissing the recipient afterword. There may be a huge amount of santorum on her lips afterward. This is fine if you are into that sort of thing.
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.