Gammed on
Gammed on is Irish slang for clued in. A more dramatic version of copped on.
Ya never gammed on that the lad sellin' ya the car was a chancer, ya gom.

Good evening. The butler let you in? Would you like me to translate 'Gammed on' in use for you?
You failed entirely to apprehend that the gentleman selling you the motor car was a charlatan, you poor fool.
Any good?
Questions
What does gammed on mean in Ireland?
Clued in. A more dramatic version of copped on.
How do you use gammed on in a sentence?
“Ya never gammed on that the lad sellin' ya the car was a chancer, ya gom.”
Updated