A Li'l Twat Munchiken Arsehole can be defined as a male most likely around the ages of 40 who was unlucky enough to have the blessings of god and thus lacks the gift of puberty. Basically another word for "small pp boy" but just add a bit of McGregor twist to it.
I pity Yohan for being a Li'l Twat Munchiken Arsehole, its fine if he can't cum, adoption is an option.
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.