I don’t get the joke and at this point I’m too afraid to ask

he always says "my mom" as the punchline

I know that part
I mean with the context of the image

He did his mom

Judging by what he says frequently in the show, it would probably be "my mom"

I know that but I mean by the context of the image

Oh I don't know

He’s dressed up as Chris Chan. He diddled with his like 90 year old mother/grandmother

IM SORRY WHAT

I don’t recall stuttering

OH NOOOOO