Top Definition
One who has had his/her head up his/her (or someone else's) arse for so long that they have adapted to the methane rich atmosphere. See Also: Craniorectal Inversion
The Sales Department is populated entirely by methane breathers. Even if they could pull their heads out of their asses, they would probably die of oxygen overdose. See Also: Cranio-rectal Inversion
by Erich Barbarossa July 30, 2013

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