A way to say 'thank you'.
It's a nice word to say when someone does something good for you.
Examples:
Fanks for the present!
Fanks for helping me!
I say 'fanks' when someone gives me something.
Fanks for the cookie, it was yummy!
Fanks for the big present, it was the best!
Fanks for the hug, it made me happy.