This is actually a new meaning of the phrase die-hard. When I say my dad is a die-hard Fulham fan, I mean that he would support Fulham no matter what!
I got a pay rise so I am minted at the moment.I'm feeling pretty rich at the moment: minted, M.I.N.T.E.D.
He's a high-flyer, meaning he's very successful.High-flyer can also been used as an adjective: high-flying.
By saying that level in the game is a piece of cake, I meant that level is really easy.