When something is more about the appearence than the functionality or working.
Literal meaning: "I don't understand girls with high heels, it's fashion before function." (high heels are extremely uncomfortable, but fashionable)
Joke-like/metaphorical meaning:
-Look at that poser, can he even ollie?
-I don't think so, fashion before function. (Posers only look good, they can't do shit)
P.s. I'm not a native-speaker, so the examples might be a bit lame, but I'm pretty sure the definition is right.
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