It's a smiley face, imagine it sideways, the x is supposed to be scrunched eyes and the P is like the :P smiley.
DNA in text talk means "did not attend" or "does not apply."
I'll text you later.
BLAM mean
It means can't talk now
no problem
it stands for what
booty
Si
Tomorrow
tyt
Before.
It can mean anything that start with ctb ( :