An inanimate object that is ruined or sick beyond repair (i.e computer, electronics, toaster, etc.).
Also can be used as an alternate to the term "Mung" which is related to a vaginal secretion. The term "Mungchow" suggests the ingestion of such secretions, implying anything that is "mungchow", is messed up to a point to where it is the eater of bad secretions, and incapable of enjoying the flavor of red wine, popsicles, etc.
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.