Brothmouth 

Name given to Irish Immigrants in 19th century Glasgow(mainly Catholic),because when they went to get their daily meal from the soup kitchens,Scotch Broth was usually the served meal.Being generally of low genetic stock and having bigger bottom lips than normal humans,the broth tended to dribble down their chins,hence the name Brothmouth.

Gauney gie the brothmouth a bloody hankie tae wipe his mooth with

Brothmouth by KevanBarry June 13, 2006

Bootymouth

Its where your mouth smells like ass, but not in the good way like you ate someones ass, but in the bad way like you ate someones ass

Aww man that bitch had bootymouth after she left my house

Bootymouth by Thugnificent69gangstashottabra September 3, 2009

brownmouth 

Allowing a female to perform oral sex after an extended act of anal sex. Ideally, this female will have a little brown lipstick as a reminder.

That bitch was scandalous, so gave her a lot of brownmouth.

brownmouth by BTA December 27, 2007