Fear Of Getting Caught
When used as online jargon, it actually refers to a "serious" need for sex, and accordingly, you can get in a lot of trouble when your NFS is greater than FOGC. Also known as text message shorthand, used in texting, online [[chat or chatting|chat]], instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.
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NetLingo Classification: Acronyms and Text Message