1) Fare pretty well 2) Make a decent living 3) Perform sufficiently 4) Scrape by 5) Slang for a hand, fist 
When ferrets aren't knocking things down, pushing items off bookshelves, etc... they are normally quite animals. The only other sounds they will make is a kind of ferret chuckle (called a dook or dooking) and the occasional squeak.
duck (in the sense of wetting - ‘dooking for apples’ is a Halloween game involving placing your face into a basin of water to retrieve a floating apple by biting on it)
Dook is slang for a hand, fist.
plug (def. 17).