On Jan 5, 3:19   ﮮ
> RubyGems Environment:
> - RUBYGEMS VERSION: 1.3.1
> - RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
> - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8
> - RUBY EXECUTABLE: /usr/bin/ruby1.8
> - EXECUTABLE DIRECTORY: /usr/bin
> - RUBYGEMS PLATFORMS:
> - ruby
> - x86-linux
> - GEM PATHS:
>  /usr/lib/ruby/gems/1.8
>  /home/oren/.gem/ruby/1.8
> - GEM CONFIGURATION:
>  :update_sources => true
>  :verbose => true
>  :benchmark => false
>  :backtrace => false
>  :bulk_threshold => 1000
> - REMOTE SOURCES:
> http://gems.rubyforge.org/

INSTALLATION DIRECTORY indicates where the gems will be installed and
uninstalled from.

Maybe 'cheat' gem installed in your home gem repository instead
(looking at GEM PATHS).

Please try:

gem uninstall cheat -i /home/oren/.gem/ruby/1.8

HTH,
--
Luis Lavena