Most commonly known as being an acronym for the phrase "Get Shit Done". In this context 'Shit' may refer to any action or person. To GSD or a GSDer is one who is constantly multitasking and keeping themselves busy- annoying the fuck out of those who wanna chill.
"Wanna come over to my place and chill for a bit?" - Billy
"Oh I can't, I have to GSD" - Bob
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