The strangeworld between Addition and Multiplication.
To Increase in Value or Importance.
To Supersize.
To increase the value of something with no Numerical value.
Putting extraKetchup on the Burger had an addification effect to the taste.
Putting on an tighter Sweater had an addification to the size of her breasts.
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.