I suspect this might depend on the variety of English you speak? (And non-natives can fuck right off löl)
I think you need to speak the American dialect specifically. As I Brit I could not get this one at all until I came to the comments. I was thinking Kahn on the loo. Kahn on the big. Kahn on the toilet.
Yeah, that doesn't rhyme at all in my head. I can see how it would though, I just have to rewire my brain to hear it.
Montalbán, as Khan, on the john, clothes on.
On the john. OOOOOOOOH. I felt like a complete moron for not being able to figure it out. Thanks!
One cannot be expected to known every slang term for a shitcan.
There’s just so many.
Or the pan, rhymes as well as john