Grade-D Jackassery is Jackassery at any-level of Jackassery, while really referring to the "D", or, "Dick", and is a reference to the sexual theme of a form of Jackassery.

Grade-D Jackassery is, in essence, responding in giving your opinion of something or someone by choosing to say option "d" - all of the above, and while simultaneously saying something was kinky, or otherwise sexually themed humor.
dude 1 "Dude remember how Fred's ex girlfriend that cheated on him was all up on my jock at that party last night?"
dude 2 "Yeah she's one slatternly chick. What did you say to her anyway, she looked PISSED when she left!"
dude 1} "Hahahah, she said she thought there was something between us. I told her 'Well you THOT WRONG!' LOL."
dude 2 "Dude no way that's straight up some Grade-D Jackassery right there!"

dude 1 "Dude, guilty as charged brotha, sings in Bob-Marley tone ~I shot the sheriff ~ but I did not fux with that beezy!"
dude 2 "Teacher be like- 'Well, you got straight D's all year long.... You PASS with HONORS son!' -Hahahahhaah!"
by Biggie Dawg March 25, 2023
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Grade-B Jackassery is a common form of "Jackassery" on a grading-scale starting from "Grade-A Jackassery", but is specifically one level lower in intensity.
"Come on Mr. Bucknell, that form of Grade-B Jackassery is not appreciated here."

"You know I was being a Grade-A Jackass, but James you can't be following my Jackassery with Grade-B Jackassery. It's just not the same thing."
by Biggie Dawg March 25, 2023
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Grade-A Jackassery is Top-Noche Jackassery to the 10th degree. Which is triple black-belt degree and immediately licenses you as a Jedi Master or a Lord Sith or both if you're kinky like that because Grade-A Jackassery can make up it's own official titles to itself at-whim.

That's Grade-A Jackassery that only a Grade-A Jackass could do.
person 1 "Man, remember that time Adrian wore a hospital gown to the mall and the cops thought he escaped from the loony bin"
person 2 "Yeah then they brought him to the loony bin! Now that was some Grade-A Jackassery"
by Biggie Dawg March 25, 2023
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