Meaning and local context
In Newcastle, “clamming” means Extremely hungry. A familiar Geordie adjective.
Example in context
A local example is “I am clamming; let us get some scran.” In plain English, that means “I am starving; let us get some food.”
I am clamming; let us get some scran.
I am starving; let us get some food.
How to interpret it
The surrounding sentence is important when interpreting “clamming”. Use the regional sense above when the situation matches the example instead of relying on the word or phrase in isolation.
Tone and caution
It describes strong hunger, not temperature. Because this is informal regional language, tone and situation should guide whether you use “clamming” yourself or simply recognise it when someone else uses it.