To sound less formal, sure, and up-to-date, teens use FS. It is sometimes thrown at the bottom of a message or a reply. For instance:
“We should hang out later.” → “FS.”
That outfit is spectacular. → FS, love it.
The word saves the time and makes messages seem natural and cool. It belongs to a larger teen texting subculture where slang terms render the communication more familiar and demonstrative.
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