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.
it means cheese is the best
it means, i call front.