You didn’t smoke enough weed for this. The aliens are coming! Time to lock and load!

If you are looking for a serious answer, it means that the request sent from your computer (the client) to Google's computer (the sever) got corrupted while on route. This is a standard error, although most sites try to intercept the error message and put up something that is easier to understand. Usually if you wait a bit, this will go away.

If you are looking for "the truth" the squirrels are working with the aliens to bring down our interwebs so they can take over the earth and all our treats are belong to them.