Someone who's breath smells so bad, not only does it disconcertingly resemble the oddly specific stench of a sweaty vagina, it also gives other people cavities.
*scrunches face in disgust* "Jesus Christ Bill, brush your teeth, you tooth tarnishing twat"
Plural form of OU tard. OU tards are people who either attend, "graduated" from, or are big fans of the University of Oklahoma aka TardU. Oklahoma is full them of them which explains why Oklahoma isn't a desirable place.