1. Child of the Roman war god, Mars, (esp. one who is also a demigod).

2. A less derogatory term for a being from planet Mars.

3. A being who was born from the surface of planet Mars, (ie. marsborn).

4. A close descendant of a Marsling.

....or a combination of these options.
The demigod son of Mars corrected, 'I am a marsling, because my father is the Roman war god, Mars.'
by Diana_Lucius_De_Collis February 13, 2023
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One who lives on Mars with Elon Musk and drives around Tesla’s
Naww we hitch a ride to Mars with Elon and drive Tesla’s around by ourselves leaving all the earthlings behind” -First future Marsling
by rachelraeautumn February 24, 2021
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