What does the idiom cold as Toby's kitchen mean?

It means to become in contact with a cold virus and have symptoms of the cold.

its a slang expression meaning fear of completing a course of actionTo have cold feet means to regret having agreed to do something tricky, uncomfortable or dangerous. He said he would speak to her...

a kitchen that is cold.

It's a nonsense phrase used when someone is upset or sad. You pat them on the back and say "There, there." You can also say "there, there, everything will turn out right."

It's a rather rude way of saying "be quiet" - it's referring to tossing something into a trash can, as in "what you're saying is garbage so shut up."