It literally means, 'Good night, Sweet dreams, Take care'. It is used when a person chatting with some one else needs to sign off and go to bed.
Person 1: Bye.. have to go to bed.
Person 2: Gn Sd Tc
Person 1: You too :)
by hds2002 March 10, 2016
Get the mug
Get a Gn Sd Tc mug for your brother Trump.