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Someone who will never stfu,or every time they talk shit comes out of there mouth.
Dominic is a assmouth,he always talks gay,sabrina sprays shit out of her mouth when she talks
assmouth by assmaster65 September 29, 2005

assmouthavitis 

Derogatory term for an individual who exudes an unsavoury stench from their mouth while speaking, laughing, and or while opening their mouth in general.
Bill's bad breath attained such a level repugnance that his coworkers now joke that he suffers from assmouthavitis.
assmouthavitis by chimp_tickler April 16, 2004
Someone who talks randomly and without a point
John: Yesterday I met my girlfriend in the mall, speaking of the mall, they have discounts on dildos, speaking of dildos, I gotta buy one for my mother! Jack: What an assmouth
Assmouth by Assmouth666 May 1, 2011
1.)Used as a general term to describe some one with bad smeling breath. 2.) Used specifically to describe of someone who commonly performs fallacio on a person following anal sex; or one who places objects in one's mouth following the insertion of said object into the anus.
I don't think that assmouth knows where that chess piece just was.
assmouth by J_AK December 9, 2006
Derived from the Soul Caliber character "Astaroth" an asstooth is a big, bumbling, klutzy galoomph of a person who is obviously doing something that requires negative use of the brain.
"No, it's probably NOT a good idea to stick your hand in the waffle iron, asstooth"

"whatever ,asstooth" - usually said in exasperation when someone keeps talking about the new plumbing they're installing in their bathroom.
asstooth by nycbuckeye October 13, 2004

asstomouthstronaut 

a traveller who explores the ass, then immediately explores the mouth; may or may not be in the space program
"That girl moved to England. She says she's an astronaut."
"Maybe an asstomouthstronaut..."