anything that can be found on Google, an internet based search engine that contains every piece of information on any given topic so long as it has been posted at least once on the internet.
Trish: "what was the name the girl who over-dosed that used to act in that show with Gary Coleman?"
Billy: "uuuhhhh... I can't remember, do you think its Googleable?"
An adjective describing a person with a name unique enough to identify only them (or them and a minute number of other people) when it is entered into a search engine. Ironically, a person's name can be said to be googleable even if they cannot actually be found on any internet sites.