What is Open-mouth Breather?
1.
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-mouth breathers I've ever seen.
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1.
When out with people who are drinking/drunk, the person or people on drunk patrol are the people who are keeping them from getting into ..