crack rot 

The pattern of tooth decay that comes from smoking crack, typically on the front and canine teeth worse because of the way the pipe fits in your mouth.

Look at that crackhead's grill!

Damn, his teeth have a serious case of crack rot! Your grandma has more teeth than that!

crack rot by wilsr1 August 6, 2010

crock rot 

When a persons private area goes unwashed for days it results in a foul odor

I.e. It's been cooking for awhile like in a crock pot

Today at work Shawn smelled like crock rot.

crock rot by Delicious dee November 9, 2015