A trendy word or phrase that is used more to impress than explain.
A buzzword may be a newly-coined word or an old word used in a new way. Buzzwords are part of the fashion of a living language, more about style than substance.
Some buzzwords are actually useful for a period of time, but the object they describe eventually becomes less useful. Other buzzwords are simply confusing or inaccurate from Day 1.
A buzzword spends only a fraction of its life being used; the rest of the time it is being abused. The result is a phenomenon known as buzzword backlash, whereby the tide turns against a buzzword and it starts to fade from usage.
When Buzzwords Don’t Create Buzz
ClickZ (May 12, 2000)