They swear like chimneys

This terrific conflation was uttered by a college freshman relating to her parents about the language in her dorm.  It is a mashup of “swear like a sailor” (to use profanities freely) and “smoke like a chimney” (smoke cigarettes excessively).  Both involve doing something in excess which leads to the mix up, I think.  Also “smoke” and “swear” are 5 letter words that start with s.  A big thanks to John Kooser who heard this one and shared it!