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Refers to the filthy and unhealthy condition of ones mouth, including missing, fake, stained, or rotten teeth, bad breath, and the use of foul language and such. Trailer mouth is a condition that afflicts (but is not exclusive to) rednecks, especially those living in trailers.
Girl: did you watch the real housewives of Atlanta last night?

Girl 2: yeah, I hate Kim Zolciak. she has such a trailer mouth.
by Wig_flew May 10, 2018
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