User blog comment:Ireithien/I apologize for making sandwiches/@comment-26929881-20140122212420/@comment-26929881-20140123222226

"The word "butty" (a reference to the fact that butter is often used in British sandwiches) is common in some northern parts of England as a slang synonym for "sandwich", particularly to refer to certain kinds of sandwiches including the chip butty, bacon butty, or sausage butty. "Sarnie" is a similar colloquialism, as is the Australian English colloquialism "sanger". Likewise, the words "sanger" and "piece" are used for sandwich in Scottish dialect; regarding the latter, an example of the use of "piece" is "piece and ham", meaning "piece of bread and ham"".

Wikipedia.