Top Definition
a codeword for "Esther Curtis". the 1800's prostitute was a lioness that devoured her young, so when someone calls you a highway unicorn you should take that as a compliment because you are an Esther Curtis.
e.g highway unicorn is good at that
i like highway unicorn
HIGHWAY UNICORN PLAY WITH ME
by SMS (BANGERZ) September 11, 2013

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