A deceitful trick or prank. An underhanded act.
I got my old boss fired when I sent him a shenanigram while he was in an important business meeting. I wish I could have seen his face when the messenger guy stripped down to a tiny speedo, and did an erotic dance right in his face while he sang him Cindy Lauper's "True Colors"...... I really hate that douche bag
Derek: "Shenanigram delivered."