someone who, for lack of sleep or alcohol poisoning, is not completely "in control" of him or herself.
After last night with the boys, Petey was a Mars rover at work.
by Hobo Patrol November 27, 2004
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Some expensive car that only runs on one type of chocolate bars.
Q: Sir, where's the gas put in?
A: Don't you mind lad, it's a mars rover.
by Benadski August 06, 2004
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When you moon someone and spread your ass cheaks apart with both of your hands.
Just bend over when you do it."The Mars Rover"
by Jakeratt5 January 17, 2009
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Farting into the vagina of an unexpecting wide open legged slut.

Eg. you are sending that rover into mars .. unexpected uncharted territory . They are crazy and you'll never know what to expect so send that rover out boys..
Had this chick over the other night laying down with legs wide open naked , she was looking at something in depth on my nightstand I backed up and pressed my asshole to her Pussy and sent the Mars rover out.
by Milarpilowski July 13, 2019
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