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1 definition by Sister of HRH,Queen of Heights

G-chatting as you are falling asleep, resulting in mostly incomprehsnsible half thoughts and many typos. Can also be seen on other chat / messaging applications.
Sleepchatting conversation:

3:33 AM Guy: have a good night
Girl: nihjy
Girl: night
bvc im asleep
3:34 AM Guy: ha, k
3:35 AM Girl: uj hih
3:36 AM Guy: go to sleep