Food Tongue
When the bacteria in the mouth has been allowed to build up into a thick, semi-solid coating over the back and centre of the tongue. Usually a white, glossy substance with a brownish, yellowish hue. Weed/cigarette smoke, alcohol and food contribute to the stew of bacteria collecting at the back of your throat and tongue, causing sour, foul breath.
"...when y'all niggas wake up in the mornin', don't just brush ya teeth man...brush your fuckin' tongue, man...nigga's got that food tongue..." - Ghostface~Killah