What is ice?

A man with a wide, excited expression and headphones is superimposed on the right side of a car's interior, while a skeletal figure and a smirking lemon emoji are superimposed on the left and center, respectively; the man's head bobs slightly as if reacting to something, the skeletal figure turns its head, and the lemon emoji's eyes shift subtly, all within a static shot of a car's interior.