Somone who constantly uses vile language.
Hey, sewer mouth, watch your tounge.
The disgusting taste that you get in the morning on wake up. Ofter accompanied by a compelling need for a drink. This feeling is experienced most mornings but is intensified after a heavy night of drinking or after a curry.
Text 1: Hey man...how good was last night!? Had such an amazing night
Text 2: Yeah it was pretty good but the curry followed by drinking gave me the world's worst sewer mouth....
Text 3: Yeah ditto...