I think it means "Long Time No See"
Long Time No See
Long Time no see :D
ltns means long time no see
Inbd mean "It's no big deal" in text language.
BTW means By The Way in text language
in text language ttfn means ta ta for now
Inbd mean "It's no big deal" in text language.
defo
RUS in text means "are you serious".
y=Why
times