He’s YT famous for filming himself at theme parks... I mean that’s it in a nutshell isn’t it.
The comment was, well let me explain sometimes words can have double meanings, and it’s a construct that is used highly in textually based jokes.
That being he is holding a mug but I ‘could’ also be implying he is a mug.
Anyway I’ve gone on too long.... happy memeing.
Peace.