There are a lot of times that my familiarity with computers gets the best of me. Someone will say something that I don't understand (in an instant messaging conversation, let's say). I immediately will put that in to Google and figure out what it means. However, not all people think that way, leading to me explaining something that could very easily be put in to Google.
I'm usually very polite about it, but many computer people are not, and I am sure one of them is behind the site LetMeGoogleThatForYou.
For example, if you were to say "I have to get a new hard drive" and someone responds with "what is a hard drive?", you could link them to this:
It's basically a snotty way of saying "you could look this up yourself".
I got a good laugh out of it, anyway.