Often used in short term, dangerous, is a way of insulting someone that what he/she has shown off is in fact his/her own ignorance and/or stupidity.
Person A: Light speed is already archived by humanity's technology five years ago. There're reports that show...
Person B: Sir, please don't try to be dangerous.
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The more information the brain holds, the more ceases it have. Flat brain literally mean that brain does not have any cease and contains next to nothing.
Often used to insult someone in a very rude way.
Person A: d(^ _ ^)b
Person B: how can you write that backward "b"?
Person A: ...what a flat brain you are.
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