As heard in the song "Roses" by Outkast, describing the type of girl Caroline is not.

Usually said about a woman, who's cool with guys. Mars is the masculine planet, and Venus is the feminine planet. If you're down to Earth your practical, and realistic with no illusions. If a woman is down to mars she is beyond down to earth.
Only real guys go for real down to mars girls, ha ha yeah!
by Resyak March 9, 2019
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Mix of a "down to Earth" and "down to f**k".
Being so horny and excited about something (going to Mars), but still publicly humble about it.
Elon is such a "Down to Mars" type of a guy.

I have such a high expectations of the summer trip... I have to bring it more "Down to Mars" level.

She is so perfectly "Down to Mars"... just watch out for the signals.
by mike_leon August 26, 2021
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The opposite of down to earth
dreamy or artsy
Real guys go for real down to mars girls.
by Caas December 5, 2006
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