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Hair that extends over the back of the neck and/or shoulders and flows behind the head in an unattractive way. A mullet.
Check out the rockin' haircape on that guy!
by CaptainTubesock July 10, 2008
hair cape = a hip way of referring to your hair

Popularised by Amanda Bynes via her twitter.
i like my hair cape wavy or straight it just can't be dull
by jnoaccident July 28, 2010