This is a slang term that means fighting. Usually used with children. When two boys decide to get rough and start a fight they are rough housing. "Stop the rough housing you two".
There is no strong verb for play - played.
No, it is not an adverb. Roughhousing is a verb form and gerund (noun) for the verb "to roughhouse" (fight, wrestle or tussle in a friendly way).
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
It is not an idiom, it means your nose is itching.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book
"Sieve" is not an idiom. See the related link.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Simply its mean a bully.
The idiom your blood is boiling usually means that you are mad/furious.
Nothing. You have left out part of the idiom. Perhaps you mean "your hands are tied," which means that you have no power to do anything in a given situation.