the end of a boner or an ass hole's face
by Anonymous April 27, 2003
A chunder helmet. Using your hat like a bag to catch vomit when in a precarious situation such as a car or in public.
Jimmy was so drunk and dying for a vomit, he didn't have time to ask the cab to stop. Instead he had to use a chelmet.
by Chelmet Champ July 17, 2016