- implies someone who is (sometimes) not too bright, unkempt, nerdy.
He is such a mouth-breather.
Last edited on May 12 2013. Submitted by JoAnn from Denver, CO, USA
on May 21 1999.
- Someone who breathes through the mouth. Basically the same meaning as "slack-jaw;" a stupid person who advertises that stupidity by letting his mouth hang open.
A typical mouth-breather came into the store yesterday.
Last edited on May 16 2011. Submitted by cameron from New York, NY, USA
on Oct 21 1999.
- used in a derogatory sense, it means slack jawed, stupid, ignorant, unwashed masses, goofy, unprofessional, dumb, uneducated.
That jerk was a mouth breather.
Last edited on May 16 2011. Submitted by Ginny R. from Mesa, AZ, USA
on Oct 12 2002.