4FS

For F***’s Sake

Straight up online jargon. Since it's a combination of letters and numbers, it’s considered leetspeak which is used in texting, online chat, instant messaging, email, blogs, newsgroups and social media postings. Also known as text message shorthand, chat acronyms, cyberslang and abbreviations, it's word.

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See also : WTF RUFKM 4Q

NetLingo Classification: Acronyms and Text Message

Texting Terms: NetLingo’s Largest List of Online Acronyms & Abbreviations