Chunder Cannon 

When one is held horizontally above the ground and then 'loaded' with excessive amounts of alcohol before being 'fired' (rocked) backwards and forwards a number of times. If this process does not induce chundering, then the cannon must again be reloaded and the process continued until successful vomiting is induced.

guy 1, "load the cannon"
guy 2, "loading the cannon"
guy 1, "fire the cannon"
guys 3, 4, and 5..., "firing the cannon"

the chunder cannon is then performed by the suspended individual

Chunder Cannon by thebathchundercannon April 6, 2010