A blunger is a machine commonly used in the pottery industry for mixing clay and water. A blunger usually consists of a round or octagonal tank with a mixer. Clay is added to the water-filled blunger and then mixed into a slurry, which is also called slip. This slip can be then sieved and magnetted as it is emptied from the blunger. In the potbank...
• (n.) A wooden blade with a cross handle, used for mi/ing the clay in potteries; a plunger.
Blun'ger noun [ Corrupted from plunger .] A wooden blade with a cross handle, used for mi...ing the clay in potteries; a plunger. Tomlinson. 
Machine for mixing water with clay. The clay is fed into a hopper and goes through a system of angled rotating blades to mix it with the water.
A machine for mixing pottery bodies and other materials in a fluid state. Blungers are containers in which paddles revolve. They are filled through the top and the fluid mixture can be drained off through taps in the bottom. Hand blungers are portable mixers which can be used in appropriate containers.
Machine for mixing clay and water in the production of casting slips
Machine for mixing water with clay to create slip. The clay is fed into a hopper and goes through rotating blades to mix it with the water. 
a large container with rotating arms for mechanical mixing of clay with water. · a person who blunges.