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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