Duck is a very lame, boring, easy, or useless thing. It's mostly used as an insult, or to say a person isn't very cool or nice.
Hero is an interesting, yet difficult thing. It's used to say something or someone is really cool, nice, or poular
Duck to Hero is a term used as a scale measurement. It would be used to compare things.
"On a scale of Duck to Hero, how hard do you think the test was?"
"That swim practice was really Hero, we had to swim a 200 butterfly."
"She's such a Duck! She didn't know what -9+-7 was!"
OMG! Suzy is such a Hero! She is like, the coolest girl in the grade!"
Duck duck chicken is a game you play in localities with a significant, open transgender population (Singapore, Thailand, India, etc.) where you try to guess whether a female appearing prostitute is a duck (biologically male) or chicken (biologically female).
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.