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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