Someone who tells the cops vital information that leads to an arrest of another person

The slot in a cell door in jail or prison in which to pass food, mail or other items through.

Someone who farts in the bath tub and the bites the bubbles; can be more than one person biting each other's bubbles

When you get more responsibility at work but no raise.

Using utra small dosages not to trigger a psychotropic effect

The way you spell smoking after you become President of The United States.

Smocking is body painting for sexual gratification.

While the majority of body painting is done for artistic reasons, smockers belong to the subgroup that's just interested in getting their kicks. Normally either a negative or playful context, smockers aren't generally considered artists.