What it means
A zinger is a quick, sharp line that hits right on time and gets a laugh because somebody just got lightly roasted or fully fried. It's the kind of comeback that makes the room go oof for half a second, then lose it. Usually short, clean, and tossed out like it was nothing.
Usage examples
"Dave rocks up with a fresh fade, so I go, mate, did you get that done at B&Q? Whole pub howling while he just sips his pint, unbothered."
"She dropped a zinger about his parking that had the whole office howling, even the boss could not keep a straight face."
"He tried flexing his new business idea, and she hit him with, so it's Uber for socks then? Proper zinger, table was gone."
"Nah, that wasn't just a joke, that was a zinger. Man got cooked and had to laugh through it."
"He kept banging on about his crypto plan, and Jess goes, so it's a pyramid with Wi-Fi then? Absolute zinger, whole kitchen folded."
Where it comes from
Zinger is recorded in American English from the 1800s for something striking or full of punch. It grew out of zing, a lively word tied to speed, force, and that clean hit of energy. By the 20th century, zinger had settled into its popular sense of a sharp, funny remark that lands hard.