The Brief:

Senioritis refers to a state of mind that many high school and college seniors experience when they are close to graduation. 

Bluesquiggle
DEEP DIVE

Senioritis typically afflicts school seniors by making them lazy, unmotivated, and prone to procrastination. Senioritis is typically caused by seniors feeling that they’re already “done” with school because they’re so close to graduation.

Those who are experiencing senioritis may be prone to skip class, avoid studying, or generally goof off.

https://twitter.com/KyleACadiz/status/1123696946181492739