cagg - Vulgar Dictionary definitionTo cagg; a military term used by the private soldiers, signifying a solemn vow or resolution not to get drunk for a certain time; or, as the term is, till their cagg is out: which vow is commonly observed with the strictest exactness. Ex. I have cagg'd myself for six months. Excuse me this time, and I will cagg myself for a year. This term is also used in the same sense among the common people of Scotland, where it is performed with divers ceremonies.