Smurfing is a type of network security breach in which a
network connected to the Internet is swamped with
replies to ICMP echo (PING) requests. A smurf
attacker sends PING requests to an Internet
broadcast address. These are special addresses
that broadcast all received messages to the hosts
connected to the subnet. Each broadcast address
can support up to 255 hosts, so a single PING
request can be multiplied 255 times. The return
address of the request itself is spoofed to be the
address of the attacker's victim. All the hosts
receiving the PING request reply to this victim's
address instead of the real sender's address. A
single attacker sending hundreds or thousands of
these PING messages per second can fill the
victim's T-1 (or even T-3) line with ping replies,
bring the entire Internet service to its knees.

Smurfing falls under the general category of Denial
of Service attacks -- security attacks that don't try
to steal information, but instead attempt to disable a computer or network.
A Google search yielded the following German text which seems to fit your context of " money laundering".HTH

Führt ein Finanzdienstleistungsinstitut mehrere Finanztransaktionen im Sinne von § 2 Abs. 1
GwG durch, die zusammen einen Betrag im Wert von DM 20.000,-- oder mehr ausmachen,
ist es zur Identifizierung der auftretenden Person gemäß § 2 Abs. 2 GwG verpflichtet, wenn
tatsächliche Anhaltspunkte dafür vorliegen, daß zwischen den Transaktionen eine
Verbindung besteht (sog. Smurfing) und deshalb von einer künstlichen Aufsplittung einer
einheitlichen Finanztransaktion ausgegangen werden muß.