YAF means in internet slang your a f*ck
the internet originated from...
The wildly popular internet slang 'GR8 ' stands for great
I am fairly certain that no prob is a slang term that originated on the internet just as many longer phrases have been shortened to accommodate word restrictions on certain forums.
"LIEK" is an internet slang term that is often used as a misspelling of "like." It originated from the early days of online chat and social media platforms.
SOS or soz as it is more commonly used is the internet slang for sorry
If you mean slang as in internet slang, then it means "Certified Old Fart".
Hippie slang originated from a combination of African American Vernacular English, Beatnik slang, and countercultural movements in the 1960s. The hippie subculture embraced terms that emphasized peace, love, unity, and personal expression. Many of these slang words and phrases are still used today.
In internet slang it usually means "No strings attached."
AFK is slang already. It stands for Away From Keyboard.
"50 slang" could refer to slang from the 1950s (such as "cool cat" or "greaser") or slang that originated in the area code 50 in Minnesota. More context would be needed to provide a specific answer.
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).