by V e r o n i c a May 30, 2006

by Metripod67 December 4, 2017

A nearly wiped out ethnic group of humans who breath very noisily through the mouth only. Major causes of death are from suffocation while: giving blow jobs, eating, or attempting to breathe from the nose.
1. Alex almost suffocated yesterday while eating; he must be a Mouth Breather.
2. Sadly, Alexis suffocated while giving Mr. Andryszak a blow job. She was the last female Mouth Breather.
2. Sadly, Alexis suffocated while giving Mr. Andryszak a blow job. She was the last female Mouth Breather.
by Douglas Page February 22, 2005

Any girl that makes out with anyone when drunk all the time. Be it with friends or random people, this person will not sleep with you and leave you blue balled for eternity.
Guy : "So, what did you do last night?!"
Girl : "Got drunk, made out with someone I just met that night, again."
Guy : "Did you have sex with him?"
Girl : "No!"
Guy : "You are such a slut mouth!"
Girl : "Got drunk, made out with someone I just met that night, again."
Guy : "Did you have sex with him?"
Girl : "No!"
Guy : "You are such a slut mouth!"
by Evil-Boy June 24, 2006

by $hane18 January 25, 2018

To talk back to someone while being a smart ass. Something an old fashoned grandma would say, along the lines of "Dont sass me"
Christian was very hateful on the phone with the nurse, so she yelled "Dont back-mouth me!" and hung up on him.
by strawberry0666 May 29, 2007

by Rahl07 June 1, 2014
