Nothing - it looks like some kind of abbreviation instead of an idiom.
Twin
This is a term used when someone turns red (blushes) because they are embarrassed.
Your face usually turns red when you are embarrassed, so this phrase means that someone was ashamed of something.
NME was created in 1952.
NME Radio was created in 2008.
NME TV ended in 2012.
NME TV was created in 2007.
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