What is the English of bastusin?

"Bastusin" is not a common word in English. It's possible it's a word from another language, perhaps a dialect or a misspelling.

To help me understand what you mean, could you please provide more context?

For example:

* Where did you hear or read this word?

* What was the context of its use?

* What do you think it might mean?

Knowing more about the situation will allow me to help you find the correct English translation.