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Possessing some or many of the qualities of Father John (father of pruane2forever/sexman/jawsus). This includes being an extreme alcoholic, swearing often, having a strong Irish accent, and/or having a large space between the front teeth.
Words/Phrases people tend to use if they suffer from FatherJohnism:

"UP IRELAND!", "Juanito Calito", "HelloOoOoOo", "He was just a corrupt person!", "So what'd I do? I hit 'em through d'other side uh d'window!"
by Rick Coker February 21, 2009
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