Whenever I go into the Guitar Basics forum or the Gear forum people recommend amps but always say that this cheap beginner amp can't handle teh br00talz. What is this this "teh br00talz" they speak of?
Don't worry about "teh bootalz." They only want to sound hardcore by typing like a douche.

Edit: What they mean is that many practice amps aren't suited to handle the sheer "brutality" of guitar playing. They generally only have a tiny gain/mid/treble range, although there are a few exceptions.

Crazy metal distortion, like Pig Destroyer or Slayer sounds. Most small amps have baddd built-in distortion and bad speakers.