The meaning of YTB is slang on the internet for You're the Best. There are a number of other common slang terms such as LOL (laugh out loud) and TTYL (talk to you later).
If you mean slang as in internet slang, then it means "Certified Old Fart".
'Lol' means 'Laugh out Loud' in Internet Slang.
YAF means in internet slang your a f*ck
In internet slang it usually means "No strings attached."
SOS or soz as it is more commonly used is the internet slang for sorry
ttyl means TALK TO YOU LATER
it means *am*
it means how are you
Thanks in advance
For internet slang; TAI = Think About It