Why whould someone be sued for using oogle? How many people out there use lots of other words and phrases that are trademarked or copyrighted. My opinion, you might get sued only for using it for any topic related to search or make it something like antioogle or dieoogle
Its doesnot matter to google unless u start saying that u are part of google or cheat people in name of google. Till then google wont come looking for you
TMs protest against similar or CONFUSINGLY similar marks. If you make a sight similar to google or somehow use the name to try to direct traffic away from Google, then there could be problems.