Top Definition
Someone who keeps their mouth open, often with tongue sticking out; appearing mentally deficient. Implying the person has brain damage or is mentally deficient.
All his friends were idiots and morons; the biggest collection of open-mouthed breathers I've ever seen.
ayon kay Timbotron3000 ika-28 ng Mayo, 2006
6 Words related to Open-Mouthed Breather

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