You DO understand that there's an ongoing thread containing FR's various abbreviations and terms, right? But since you're lazy...
IB4Z/IB4TZ = In Before (b4) zot/In Before The Zot
Zot = sound effect emulating a lightning strike, means a user got banned
NB4TZ = not before the zot
hugh and series = mocking form of "huge and serious"
Link?