Truck-kun en · PROPN
Etymology
From truck + -kun.
Meanings
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(Japanese, humorous, slang) In the isekai genre, a truck that sets off the plot by hitting the protagonist, transporting them into the fantastical setting (typically by killing them in the real world).
So I figure I might as well chuck a "Truck-kun" into my own story too! Gotta get in while the getting's good!!
2023, Shizuki Fujisawa, translated by Cerridwyn Graffham, The Transcendent One-Sided Love of Yoshida the Catch, volume 3, unnumbered page:While Truck-kun does cause one form of ending—the character is dead in their original world—it's an integral part of the main character's transportation to a new world, one where they can explore, learn, and grow.
2022, Natasha Yglesias, Anime Tarot Deck and Guidebook: Explore the Archetypes, Symbolism, and Magic in Anime, page 29:What if I was walking across the street when I was summoned, only to be dropped back in front of a speeding truck. Lots of dodgy stories start with Truck-kun, and I don't want mine to end with it.
2022, Dean Henegar, “The Summoned Life”, in Legendary LitRPG: An All Genres LitRPG Anthology, unnumbered page: