When a person promises to do something so grandiose, that it is quite clearly obvious that they will not be able to follow through with said promise.
A grandiose promise that won't be fulfilled and is made in an effort to show off.
*Maxamillion is running for class president of New Voices Elementary and is currently speaking at his school's gymnasium debate against his rival Shillary*
Maxamillion : "If you vote for me as your class president, I will build a great playground-- and nobody builds playgrounds better than me, believe me --and I'll build it very inexpensively. I will build a great, great playground , and I will make the New Voices Elementary pay for that playground! Mark my words."
Random Student: "I've never seen you build a playground! How can you build a playground? You're only 7 years old! That sounds like a Trump Promise if I've ever heard one. You just want use to vote for you!"
*Other students yell out "Yeah!"*
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