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.
by iCarrot September 25, 2010
2 Words related to flat brain

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