Treating the term as an umbrella is what makes it useful, because at least three distinguishable patterns sit underneath it and they do not respond to the same intervention.
The first is internal affect. Stress, sadness, boredom, loneliness, and celebration all raise the appeal of a purchase, and the shopping is doing work that has nothing to do with the item. The colloquial name for this limb is retail therapy, and its signature is that the object often matters less than the act, so the same person buys quite different things in the same mood.
The second is the momentary lapse, usually described as impulse buying. Here the underlying preference may be perfectly ordinary and the failure is one of timing and friction: the purchase happens in seconds, in an environment engineered to make it happen in seconds, and it would not have survived a day's delay. This limb responds to friction rather than to insight, which is why removing stored card details or uninstalling an app tends to work better than resolving to be more careful.
The third is social. Spending prompted by what other people appear to have, or by visible consumption in a peer group, is driven by comparison rather than by a private feeling. It is described colloquially as keeping up with the Joneses, and it differs from the first limb in that the reference point is external, so it tends to escalate with exposure rather than subside with mood.
Two nearby ideas are frequently confused with this one, and the distinctions are practical rather than academic. Lifestyle creep is spending that rises with income, and it is gradual, unremarkable at each step, and usually unnoticed; its remedy is to capture part of each raise before it reaches the checking account. Emotional spending is episodic and often noticed with regret, and automating a raise away does nothing about it. Mental accounting concerns how money is categorized once it exists, which is a question about labels rather than about triggers, and the two interact: a purchase charged mentally to a bonus rather than to a paycheck can feel free while being identical arithmetic.
Why budgeting methods rarely resolve it on their own follows from the trigger. A budget assigns amounts to categories and compares outcomes against the plan, and it operates at the level of the month. Emotional spending happens in a moment, and a moment does not consult a spreadsheet. That is not an argument against budgeting, which does other work well. It is the reason a household can keep an accurate budget for a year, watch the same category overrun every month, and learn nothing about why.
The honest limit belongs on the page next to the mechanics. Spending that produces genuine pleasure is not a defect, and a page that treats every mood-led purchase as a failure has substituted a moral judgment for an analysis. The patterns worth changing are the ones that are regretted afterward, that displace something the household said mattered more, or that recur on the same trigger. Where the pattern is persistent and distressing rather than merely expensive, financial therapy is a field that exists for exactly that overlap between the money and the feeling.