/cher-noh'b*l pak'*t/
n. A network packet that induces network meltdown (the result of a broadcast storm), in memory of the 1987 nuclear accident at Chernobyl in the Ukraine. The typical case of this is an IP Ethernet datagram that passes through a gateway with both source and destination Ether and IP address set as the respective broadcast addresses for the subnetworks being gated between.
Compare Christmas tree packet.