gagger

noun

1. A piece of iron embedded in the sand of a mold to keep the sand in place.
2. (slang)An actor or performer who relies on gags (quips).
3. (archaic, slang)A hoaxer; a deceiver.
4. One who exhibits a gag reflex.

   “When it is known that the patient is a gagger, dentures should not be constructed or even impressions made until after several therapeutic hypnotic sessions.”