Naughty.

Today we had a group of people on a coach from South Wales.
Ate a lot of cake.
Drank a lot of coffee and tea.
As I brought two slices of coffee and walnut to two ladies they rubbed their hands together.
"We're on holiday," they said, "and when we're on holiday we always have mucky cake."
The word "mucky" was delivered with relish and an eye twinkle.