Extra Terrestrial or E.T for short is the name for an Alien, that is not from this planet.
an extra-terrestrial, an alien
If you mean slang as in internet slang, then it means "Certified Old Fart".
YAF means in internet slang your a f*ck
E.T. is an abbreviation for extra-terrestrial.
SOS or soz as it is more commonly used is the internet slang for sorry
it means *am*
disconnected
In internet slang it usually means "No strings attached."
MOO is internet slang for "My Own Opinion"
Not right now.
Love And Kisses
NTH stands for nothing in internet slang.