crammer

noun7

1. •
   One who crams or stuffs.

   • The pigeon crammers of Paris took mouthfuls of grain and water and spat it into the mouth of a pigeon. — 1959
2. •
   A student who studies hard for an examination.
3. •
   A teacher who aids such a student.
4. •
   A school whose speciality is helping students to pass certain examinations.
5. •
   A book used for accelerated study in preparation for an examination.
6. •
   (slang, old-fashioned) A liar.

   • Look here; do you mean to call me a crammer? — 1894
7. •
   (slang, old-fashioned) A lie.

   • I'm afraid he wouldn't mind telling crammers about it if he was questioned. — 1939