When you're through with complaining about all the work you have and you just plow through it because it needs to happen. Can occur as a day, a certain block of time, a week, etc. Often seen in Facebook statuses towards the end of the semester.
GSD is brought about through severe bout of procrastination, not getting work done on a regular basis, therefore needing to set aside long amounts of time to disappear and get shit done.
Brett is at the library GSD.
Isaac is GSD from 8-12; no parties tonight.
Brittany has hereby declared this to be GSD Week. Let the games begin.