Generock stems from the words "generic" and "rock". This term can be used colloquially when refering to bands, mostly led by Foo Fighters after the grunge-era of Nirvana, which try very hard to play the same shit everyone else is playing. Examples can be finger eleven, Nickleback, Sum 41 or Jet.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

Rock bands that were once unique and dedicated to producing solid music, who've now sold out and produce generic crap after generic crap. (AKA: Blink 182, Nickelback, Sum 41 etc.)