The word comes from both Martyr ( to die for ones beliefs ), and Muted-Farter.
Person 2 : Eugh that's gross!
Person 3 : Who did that?
Person 4 : Not me!
Person 2 : Not me!
Person 5 : It was I, I am the marter.
Wow I've never seen everyone so angry at one person, why do they marter him so much?