When American people are talking about money/dollars, they say "box"
I have heard people from U.S. and they say, for example 100 Dollars = 100 "box" "bucks" I really don't know how to write it...
but I hope you can understand me.

Question

When American people are talking about money/dollars, they say "box"
I have heard people from U.S. and they say,  for example 100 Dollars = 100 "box" "bucks"  I really don't know how to write it... 
but I hope you can understand me.

Answer

"bucks" it is :)
It's a slang expression.

Answer

The use of "buck" to mean "money" came about, as one might expect, from the days when a deerskin(buck)  was a common medium of exchange.

Answer

my department professor(he is a Canadian) said,
"American people often use a word "bucks" instead of dollars"
and on this point, you can occur star"bucks"

Answer

That's true. I don't know why but they use it :)

Answer

http://www.merriam-webster.com/dictionary/buck

1-4-b