Top Definition
The drug-like, euphoric experience of having live, first hand contact with the band 30 Seconds To Mars or any of its members, leaving one totally and utterly addicted for life. MarsCrack highs can be produced from a range of contacts, from simply attending a 30 Seconds To Mars concert and becoming involved in that experience to meeting, photo-ing, partying with; being tweeted, mentioned, hugged, groped, etc. by the band or any of its members; or being involved in a project by or about the band.

Addicts are MarsJunkies, and will do nearly anything to get their next hit of MarsCrack. There is no rehab for MarsAddiction, but the good news is that to our knowledge, nobody has died from a MarsOverdose.
I'm on MarsCrack" means: "30 Seconds to Mars makes me high
by @MarsDiable May 16, 2011

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