What is Structuring?

Legal Definition
Structuring, also known as smurfing in banking industry jargon, is the practice of executing financial transactions (such as the making of bank deposits) in a specific pattern calculated to avoid the creation of certain records and reports required by law, such as the United States' Bank Secrecy Act (BSA) and Internal Revenue Code section 6050I (relating to the requirement to file Form 8300).

Legal restrictions on structuring should not be confused with capital controls, which are statutory or regulatory limits on the money that one can take out of a nation, though they can have some of the same economic effects in some economies, as structuring controls effectively limit the flow of capital by magnitude and duration, and can apply equally to taking money out of a nation as well as putting money into its finance system.
-- Wikipedia