I agree it took me a bit of time to find the reason for it

the reason is ,

He was 'tagging' (Graffiti'ing). The little shit was spraying his 'tag' on a wall. They caught him, pulled his trousers and pants down and, with his own paint, sprayed his arse and bollocks! I'm sure I'd do that if I caught someone tagging my garden wall.

Now I see ,
the little shit