A fork of Rural Dictionary
1) A type of pun that makes you shake your head in disbelief that it was actually said.
2) A comment from a person that is expected to be taken as the gospel regards of how faulty or unlikely it is simply because of the person who is saying it.
1) While standing at the urinal, one guy says to another, "Having a pissy day?" Reply: Shakes head and replies, "Damn Matthewism."
2) "Well actually, the F-14 Tomcat is the best fighter jet because it is powered by the Commador 64 with a 28 inch floppy drive running at 87.2% capacity." Reply: no audible response necessary.
Much like being a smart ass, but in a more light-hearted manner; the action of stating the obvious for the (laughter) benefit of everyone except the person the statement is being addressed to.
Wife: "Why won't the car start?"
Husband: "I don't know. Did you put the key in the ignition and turn it?"
Wife: "Yes... ass pony."