SOGgen is a verb used by Dutch students. Used by other people it sounds weird and forced. I once saw a billboard depicting a girl in bikini sitting on the beach with the text " Hey SOGtje" written above her. It just didn't feel right: People in the commercial business using that word. And they turned it into a noun, a diminutive even, what blasphemy. The way the had written it, with a -tje suffix rather than a -je suffix indicated that they had no idea of the pronunciation. Of course they were aiming at students, but still; it was like old people using words like 'cool', 'wicked' and 'awesome' just to look young.
The letters SOG stand for "studie ontwijkend gedrag", which is Dutch for "study avoiding behaviour". A noun phrase indeed, but never used as such.
It's used amongst peers:
" Did you study for the exam?"
" Well, I tried to, but I was mainly SOGging..."

SOGgen could be reading your e-mail, chatting with your friends, making a phonecall, playing video-games, watching TV, and so on... Going out is hardly ever counted as SOGgen, nor are neccesary things like cooking and cleaning, unless of course one deliberately takes too much time for such things. SOGgen isn't planned, it's just something that happens.
In earlier times students would fall asleep on top of their books, now they start to SOG. I think it's also some sort of euphenism: " I was SOGging" sounds a lot better than " I'm bloody lazy".
It's an excuse for not having studied. You realy, realy tried to... But then you went SOGgen.

I think that SOGgen is caused by the modern world. We aren't taught any discipline at school. If people fail their exams it's not their fault, but the exam's. If we did not study, it was not our fault, but that of our computer and television. We're surrounded by distractions, can be online 24/7 and don't want to miss our favorite TV series either.

Gosh... How much time did I waste on typing this? Now that is SOGgen...