• that is one (adj. + noun)  (= really really / amazingly)

Wow, that is one tasty burger.
Dave scored 5 out of 50 on his test. He is one stupid dude.

  • go too far  (= was good, but now done too much)

At first, the jokes were funny, but in the end they went too far and Dave began to cry.

  • …is murder  ( = it’s killing you / it’s really terrible)

The traffic in Beijing is murder.
High heels are murder on the ankles.

  • …is a nightmare  (= is like a bad dream / is really awful)

Living with my parents-in-law is a nightmare. I hope we can move out soon.
My date last night was a nightmare. I hope to never see her again.