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.
Wow, I haven't heard this song in such a long time. Perfect generock. Can't beleive I liked this once.