Morning After Remorse Syndrome. The feeling of regret about the previous night's alcohol-induced activities. M.A.R.S. can have direct causes, such as engaging in buffoonery, or can be a general sense of remorse not attached to a specific incident. M.A.R.S. can exist separate from a hangover, as its effects are purely mental and emotional, rather than physical. (pronounced mahrz)
Guy A: Ah man, I have a really bad case of M.A.R.S.
Guy B: That's probably because you hooked up with that butterface and drunk-dialed your mom.
by WholeLottaBS January 4, 2011
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M.A.R.S. is an acronym for Mass Alcohol, Reefer, & Sex.
I joined the M.A.R.S. fan club on facebook because I love sex, drugs, and beer.
by Rod Akron April 26, 2010
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M.A.R.S. can also be used as an acronym for Marathon Ass Raping Session
Matt and Keith's buttholes were raw after M.A.R.S.
by Tittytat tisses March 28, 2016
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