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The abbreviation of the phrase Mental Shift.

An M-Shift, or mental shift, is a therianthrope-related occurence wherein a therian feels their mindset, or current mentality, becomes that of their phenotype, or animal.

An M-Shift may be brought upon by many environmental and/or sensory factors, such as weather, certain people, smell, sound, taste, etc.

How intensely an m-shift is felt, and how long they last, vary from therian to therian.

See also: P-Shift, Astral Shift, Suntherian Shift, and Phantom Limbs.
I had an M-Shift about a week back; my first in quite some time.
M-Shift by Winter Paws January 20, 2007
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Short for "mental shift." This is a term therianthropes and otherkin who wish to make excuses for their sometimes bizarre and animalistic behavior use to avoid taking responsibility for their actions; they believe that by claiming that they've "mentally shifted" into their spirit's supposed true form that they should receive pity no matter what they do.
I didn't mean to go on a murderous rampage on the full moon. Please excuse me: I m-shifted into a werewolf mentality and I couldn't help myself!
M-Shift by Puffing Tom July 14, 2010

esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 insert delete ` 1 2 3 4 5 6 7 8 9 0 - = tab q w e r t y u i o p [ ] \ capslock a s d f g h j k l shift z x c v b n m , . / shift ctrl fn alt space alt ctrl 

This is the peak of bordom, you decide that qwertyuiopasdfghjklzxcvbnm wasen't enough, and poiuytrewqlkjhgfdsamnbvcxz, and also qazsedcftgbhujmkol, and awsxdrfvgyhnjiklp, etc etc,
Person 1: bro im so boreddddddddddddddddddddd,
Person 2: have you tried esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 insert delete ` 1 2 3 4 5 6 7 8 9 0 - = tab q w e r t y u i o p \ capslock a s d f g h j k l shift z x c v b n m , . / shift ctrl fn alt space alt ctrl?
Person 1: OMFG DID YOU NOT READ THE PATCH NOTES??
person 2: wdym?
person 1: IF YOU SAY SOME WORDS THAT ARE TOO LONG YOU-
*person 2 explodes
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