It started seeing widespread use, after users on the r/manga subreddit realized that truck accidents were used as a device for propelling the plot.
An early case of “Truck-kun” emerged in April, 2015, in a thread titled “Trucks in Manga” in the r/manga subreddit.
A comment, written by Reddit user shwag945 said “oh truck-kun you are my favorite plot device”.
Spread and Usage
Within a short period of time, the name “Truck-kun” became a frequently used nickname for trucks, with users on Reddit as well as 4chan conversing about which character they’d introduce to “Truck-kun” as well as pondering upon the kill count of “Truck-kun”.