People that demonstrate their stupidity by being hoisted in ignorance by their own lack of words. Having to face the reality of "not knowing" despite the interaction with others more knowledgable than you.
At the end of the day, the bluster was ended when the petarded dude was asked to demonstrate his lack of knowledge by asking him to put up or shut up.
DD stands for dad's dad. It is for the grandfathers biologically that aren't comfortable with the notion and image they grew up with of a kid calling said human, gramps, grampa or anything so-not-cool that they latch onto the much cooler sounding DD.
Who's this?
DD. My dad's dad. The coolest grandfather on the planet. When the grandfather image don't fit, you must acquit.
She smiled, no teeth, said something about stop counting the votes and I put her down as a low I.Q. Democrat....but I spell it Republican.