Fn
fn definition by Slang.net
This page explains what the abbreviation "fn" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Fn is a simple way of abbreviating "fine." It's most often used to say "that's fine," in response to a statement or question.
For example, if your SO asks whether you're okay with having Chinese food for dinner, and Chinese is okay by you, you could answer with a simple "yup, tht's fn."
People might also use fn while discussing the relative attractiveness of hotties and notties. In this case, fn means "attractive."