Monkey speaking thai?

I am an enormously gracious person
with good manners
*ahem*

Monkey was thanking JS for something
"Korb Khun Kaa"
it means Thank you very much in Thai

JS: "Mai Bpen Rai Krup"
well suppose it means u are welcome
or don't mention
*well something like that*
and I do not know how to reply that
and being so polite and well mannered I have to acknowledge that

So monkey answered back: "Krup Krup Krap Krap"
JS: "Wat's that?"

Monkey: "eating keropok sound."
JS -_- : "Thought your Thai improving but doesn't sound like it."