I never heard the term Q Drop, but Google Search shows possibly 2 meanings:

As it relates to the Texas A&M:
Effective Fall 2008, a course dropped after census date in a term will receive a grade of “Q”. Drops with “Q” grade will not affect the GPA overall status.


As it relates to QAnon Conspiracy, which I know nothing about, “Q drops”:
The cryptic messages that are at the heart of the conspiracy theory.

Not sure if the postings are deliberately cryptic for some reason or if conveying some inside joke.

Have fun!