It commonly refers to one of two things:
1. Tight Teen Box - An attractive female in her teen years.
2. Time To Block - Removing someone from a social media friends list because of inappropriate or strange behaviour.
If you mean slang as in internet slang, then it means "Certified Old Fart".
YAF means in internet slang your a f*ck
SOS or soz as it is more commonly used is the internet slang for sorry
disconnected
it means *am*
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.
Broadcast - from Blackberry Messenger
"Bend Over Whore"