Sarnie is a British slang term for a sandwich. It is commonly used in the U.K. and is often referred to as a sandwich made with two slices of bread and a filling. However, there are a plethora of synonyms that can be utilized for the word sarnie. Some of the commonly used ones include butty, bap, sub, hoagie, roll, wrap, pita, and more. Each of these terms adds a unique twist to the classic sandwich and is used to describe a specific type of sandwich. So, the next time you want to mix up your sandwich game from sarnie to something else, consider using one of these common synonyms.