A person who continues to misspeak, even after being corrected. Read more about the interesting origins of the word.
"Say that to my face, you limp-noodle!" from Disney's Mulan.
Yoo-hoooo! Be a doll and add a funny insult.
A clumsy person (Yiddish). Literally means "a block of wood." I suppose a synonym for that would be "blockhead," a la Charlie Brown.
Can't say I'm one to talk...