What it means
A Northern English intensifier meaning very or really. You stick it before an adjective to crank things right up, like dead good, dead busy, dead funny, dead tired. Nobody's talking about actual death, it's just everyday emphasis, dead normal in places like Manchester, Yorkshire, Liverpool, Newcastle and wider UK chat.
Usage examples
"This queue for the tram is dead long, our kid, and it’s freezing. I’m dead starving, so let’s sack it off and hit the chippy."
"It's dead busy in town today, took me twenty minutes just to get across the precinct."
"She's dead chuffed with her exam results, been showing the certificate to everyone on the street."
"That kebab was dead nice last night, I'm still thinking about it now."
"He's dead late again, so we're just gonna start without him."
Where it comes from
This use of dead as an intensifier has been around in English for centuries. It grew out of the older sense of dead meaning complete or absolute, the same vibe you still catch in phrases like dead centre or dead silence. In Northern England it stayed lively in everyday speech and kept that booster-job before adjectives.
