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!"
A shot of vodka, drunk from a child size glass featuring pictures of ducks.
I had three ducks last night, but I felt fine so I filled another to the feet.
Michael drank a duck to the feet, but his tolerance is low, so he is sodden to the gills.