F***ing A Hot
Online jargon, also known as text message shorthand, used primarily in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.
The term "Hot" in this case refers to something attractive, and the term "A" is an expression to add emphasis as in "You're 'F***ing A' right about that" which means this saying indicates that someone is extremely attractive.
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NetLingo Classification: Acronyms and Text Message