You may have seen in the news that Google is researching methods to censor the web.
Google's censorship is nothing new: they've been censoring this site for nearly 7 years.
And lying about it. You can read
more about Google's censorship here.
Definitions include: Expression of disappointment, similar to 'bummer', though more forceful. 'Bummer' tends to be used when something unforeseen and unfortunate occurs. 'Rats', on the other hand tends to be used when you have been making a concerted effort to do something and it suddenly fails. You only use 'rats' about your own misfortune. You can use 'bummer' sympathetically also about someone else's misfortune.
Definitions include: statement of agreement used when someone corrects one of your prior statements, and their correction was unnecessary because you are aware of that, and either the other person misunderstood you or you didn't phrase it well.