I had never heard the phase before today. I was at the drug store having some prescriptions filled and they handed me a form to fill out. It was just standard stuff...name, address etc. I said I had already filled one out...as it turns out, they had the date of birth wrong...1992 as opposed to 1952...anyway a few jokes about fountain of youth, new anti-aging break through yadda, yadda...anyway, the young pharmacist girl said. Well, you feel 22?...I said I don't know you'll have to feel me and see...laughter and said...that's dad humor...I love dad humor....can someone better define dad humor for me?