Fixed it for ya.
But I think you misunderstood the quesiton. I wanted to know who started referring to the Super Hornets this way. Is it an unofficial name used by pilots, like Viper, Warthog, etc? Or is VRS responsible for coining it? I ask this because I haven't seen Superbug linked to the F/A-18E/F anywhere on the interent other than discussions related to the VRS' add-on for Flight Simulator.