I know! This is totally unorthodox, but the term originally comes form children cartoon, the Smurf, who were small blue creatures (as far as I remember). In finance however, this refers to the practice where instead of depositing a hug sum of money in one go, and thus be liable to be reported to financial authorities, a prcedure to combat money laundring, one breaks down the sum into smaller ones (perhaps here is the connection to the cartoon), each below that threshold. In the Arabic version of the show, these creatures were called "السنافر". Why not invent the term in Arabic, and use the verb "سَنفَر" to indicate the same! Unless of course there is a term that is exact equivalent. Good luck :-)

الكلمة عند استخدامها في لغة الأعمال تعني غسل الأموال بشكل متكرر

وعند استخدامها مثلاً في لغة الانترنت تعني الهجوم على المواقع الالكترونية عن طريق إرسال أوامر الـ Ping كي يتعطل سيرفر الموقع

او: غسل الاموال باطراد

I know this is a long phrase, but I think it gives the meaning of small sums of dirty money being "sneaked" into the banking system. Nothing of the above could have all these meanings together.