Top Definition
The act of sticking a mars bar into ones vagina/anus/any other inappropriate cavity of the body besides the mouth, then eating it.
1. HER: "Hey you have a bit of chocolate in your teeth"

HIM: "Oh, yeah, I was just marsing my girlfriend."

2. HIM: "Wow, your vag tastes like mars bar."

HER: "Yeah, that would be because I was recently marsed."
by Hong Long September 26, 2009
Male response to stimuli as a result of the culmination of all thoughts and ideas which may influence a man's perception at any given time. Often contributes to serious miscommunication, especially with the opposite sex.
Thanks for taking out the trash. I mean that exactly, don't go marsing it up on me.
by JJDunn August 17, 2015

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