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1.
Slang for know-it-all of smart ass. If you were to say something and someone was to reject what you said by proving it wrong you would call him/her a sass mouth.
'Dude, trust me your wrong.'
'Quit giving me your sass mouth.'
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Words related to sass mouth:

ass civil cooperative obedient respectful
 
2.
being smart and/or cheeky
when jflex talked back his mother used to say 'stop that sassmouth!'
by t dogg September 21, 2005
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