The story
Blend of fluff (“fan fiction, or part of a fan fiction, which is sweet and feel-good in tone”) + one-shot (“a fanfic of only one chapter”).
Etymology from Wiktionary, CC BY-SA 4.0.
fluffshot
Today it means: A single-chapter, feel-good fan fiction story, usually involving wholesome romance; a one-shot that contains fluff. Full definition →