Someone who is highly skilled in one area but completely useless in all others. Complete oposite of jack of all trades
John was unable to change the light bulbs in the house as they were 60 watts and he had only been trained to change 100 watt bulbs as John is monoskillabic.
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.