Source : Free On-Line Dictionary of Computing

Godzillagram
     
        /god-zil'*-gram/ [Japan's national hero and {datagram}] 1. A
        network packet that in theory is a broadcast to every machine
        in the universe.  The typical case is an IP datagram whose
        destination IP address is [255.255.255.255].  Fortunately, few
        gateways are foolish enough to attempt to implement this case!
     
        2. A network packet of maximum size.  An {IP} Godzillagram has
        65,536 {octets}.  Compare {super source quench}.