How do you get banned for life on WikiAnswers?

Any violation of the Terms of Use on WikiAnswers can lead to a block. The length of that block will depend on how extreme the violation is, how many times they have broken the rules, and how the individual responded to the warnings, if any. Cyberbullying and foul language are pretty fast ways to earn a permanent block. The same goes for spamming, particularly illegal products/services such as drugs, prescription medications, or certain "adult" services.