fag-osis Share definition Flag a condition caused by extended exposure to immense homosexuality. Symptoms include tearing out hair and beating of the head spontaneously against the wall. Don't watch that movie, you might catch fag-osis. fag-osis by nocure913 August 1, 2007 0 0 Get merch Get the fag-osis mug. Buy Now — $32.95 See more merch