Similar to wikipedia, though not anywhere near as factual. Grandmapedia is knowledge that is not available on the internet, as Grandma is not connected to the Internet and generates her own facts and content.
Grandma: The Rolling Stones band is very well educated. You know Mick Jagger has two PhDs.
Daughter: No, mom. I don't think that is accurate.
Grandma: Yes it is. The whole band is highly educated
Grand daughter: I find that hard to believe.
Grandma: Keith Richards also graduated with some great degrees.
Son: I believe that this is factual according to grandmapedia, though may not be available on wikipedia.
The wrath of the family matriarch that is generally triggered by doing something tremendously displeasing to Gma. This wrath can range from cold stares and cutting comments around the Thanksgiving table, to extended guilt trips, to having family lakeside cabin privileges revoked, and even to having her rewrite you out of her will.
Grandmageddon should be avoided or delayed at all costs, because unlike other people, she is much more likely to carry her grudge to the grave- mainly because the crazy old bitch is not to far from it.
"Dave doesn't look to happy about going home for the Thanksgiving break."
"That's because he has to tell his Grandma that he and Julie are planning on spending Christmas in Cancun. He's planning on triggering Grandmageddon on his last day there."
"Oh? How sad- he was really looking forward to getting that '09 BMW. Well, so much for that."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"