The weird shit people do in the back rows of cinemas, lecture theatres etc. Can refer to joking around, eating cereal, grinding Fortnite and making out as well as anything else deemed a shenanigan.
Lawyer: “Your honour my client was just engaging in some back row shenanigans
Judge:

“Your client was whacking off during a screening of Paddington 2”
by Fivestarman December 29, 2022
Get the Back row shenanigans mug.