An impulse buy is something bought on the spur of the moment. A silly impulse buy, an impulse buy at the till.
The whole layout of a shop is built around producing them, which is why sweets sit by the checkout. An impulse buy is usually small, and the total across a year is not.
1nounimpulse buySomething bought on the spur of the moment.
“The hat was an impulse buy she wore exactly once.”
impulse buy is a purchase.
Practised in Shopping & Money