We call it
on a stick, because that literally what it is.
Imagine compressed mixed minced lamb formed from goodness knows and mixed with goodness knows what, then stuck on a stick.
In the takeaway restaurants, I have never worked out how the are legally allowed to use them as it breaks every Food Safety law there is. There's gas burners behind the rotating stick so the outside get warmed and charred.
At the end of the night they put them away (presumably in the fridge), and the next day are heated all over again.
Repeat daily until all used. Given the size of them, they start off absolute massive, a good foot diameter and at least 4ft high so some places the same one must last at least a week.
The first few bites are quite tasty, then a few more and you realise its the greasiest most disgusting thing you've ever had. If you're totally blotto, you may consume half a portion before realising this.