What it means
Means very quickly, basically in no time. You say it when you want to sound breezy and reassuring, even if the clock might end up doing a tiny bit of extra cardio. A jiffy isn't a real measured unit, just a cozy little speck of time people understand straight away. Feels a touch old-school, but it's still alive in everyday chat.
Usage examples
"Give me a minute, I’ll be back in a jiffy, just grabbing my keys and a coffee, then we can head out."
"Hang on, I will have the kettle on in a jiffy."
"Pop your coat on, the taxi will be here in a jiffy."
"Text me when you're outside, I'll be down in a jiffy."
"I'm just swapping my shoes, we'll leave in a jiffy."
Where it comes from
Jiffy has been in English since the late 18th century as an informal word for a very short moment. In a jiffy grew naturally from that and came to mean in an instant or very soon. It's old, well settled, and still has that friendly promise-you-won't-be-waiting-long vibe.
