The most common way to finish the phrase of "Be the talk.." is to say "Be the talk of the town.".
"To be cheeky" IS an idiom. It means to sass or talk back.
To talk fast.
to misunderstand
a full schedule; a lot to do
To talk about work while you are in a recreational setting.
It means talk a lot - a whole lot!
If you have your hands full, you can't do anything else with them, can you? This idiom means that you're overloaded and don't have time or ability to do anything else.
To "take off full blast" means to start quickly. The idiom refers to a motor or jet engine starting off at full blast or full throttle, which would be as fast as possible.
The idiom usually refers to a suggestion against which many arguments were presented.
to hide something and not talk about it.
This idiom means that it's easy to talk, but talk is not action.
'Talk is cheap' is a proverb; a proverb is a little story with a moral message. An idiom is a phrase that makes no sense unless you already know the definition - this phrase does make perfect sense.