1. a potato
Usage: informal; chiefly Irish or British
2. Murphy's Law: the humorous principle that anything that can go wrong will go wrong
Usage: often capitalized; informal

Examples

• She boiled a pot of murphies for dinner.
• The recipe calls for three large murphies, peeled and diced.
• According to Murphy's Law, if something can go wrong, it will.
• The project failed—Murphy's Law strikes again.
• He mashed the murphies with butter and cream.