"Grattering", or having a "gratter" is a term for a person, who uses social networking to meet several girls, and flirt with them all at the same time... Or you can even have individual gratters. To "gratter" you have to know them in some way. It is harmless flirting that means nothing, normally, but in some cases, leads to an actual relationship.
*on msn* Gratter: "Hey baby, you were looking pretty in school today, and you're really nice...:) <3 xx"
In general terms, an uncomfortable place. A dusty, awkward corner. Usually the gap sometimes created between a singlebed when moved slightly away from the wall.
"What's up with you? Did you get out of the wrong side of bed this morning?"
"Certainly did. I woke up to find myself halfway down the gratey!"