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2.
The feeling left in the mouth and throat after a heavy nights drinking. Impossible to brush out, eat out, sleep out or get rid of in any way.
Rob: Alright Olli, what you get up to last night.

Olli: Got fucking rat assed on vodka at some party then like passed out on some girls bed.

Rob: Sounds heavy

Olli: Yeah man I have serious rat mouth right about now
by DeeTown November 07, 2008
4 2
 
1.
any person that fakes in your face and go behind your back tell all kinds of lies and make up rumors about a person.
cIARA TOWNES IS A RAT MOUTH SHE GOES AROUND TOWN CLAIM COOL WITH DIFFERENT PEOPLE AND THEN SITTING UP GOSSIPING RUMORS ABOUT THEM,CLAIMING SHE THE REAL DEAL.
by KALASTARR September 23, 2009
5 3