I'm kind of surprised that no one has really answered this yet...
if not something:
DoSomething()
I should also add that although there isn't all that much documentation for Boo itself, this shouldn't prove to be too much of a barrier: Boo is a CLI language with Python inspired syntax. Thus, boo behaves like C#, and shares the same API (if with different keywords), while it's syntax is practically identical to Python. If you're interested in using Boo, first learn python (an awesome language in and of itself), and then go to boo.codehaus.org to get up to speed on the (few) syntactic differences with python.
The only real impediment with learning boo is the syntax, as mechanically, it's practically identical to C# and UnityScript.