A fast-food hamburger.
by Timbotron3000 May 28, 2006
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.
by Timbotron3000 May 28, 2006