Methanogen Share definition Flag A person who has head so far up his butt, for so long, that he can survive, nay must survivev, by exclusively breathing methane gas RONNIE RAYGUNS WAS A TRUE METHANOGEN. Methanogen by DOCBison October 5, 2022 0 0 Get merch Get the Methanogen mug. Buy Now — $32.95 See more merch