Gn Sd Tc 

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 :)

Gn Sd Tc by hds2002 March 10, 2016

gnsdtc 

GOOD NIGHT and SWEET DREAMS and TAKE CARE.

gnsdtc

gnsdtc by AJ200 December 8, 2009