sag wagon
n.— «The cyclists said they carry about 10 pounds of weight with them when they ride. The rest of their equipment and belongings travel with Barrett in the support vehicle or “sag” wagon, as they call it.» —“Cyclists visit Waterville en route to Key West” by Doug Harlow Morning Sentinel (Waterville, Maine) Sept. 16, 2004. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...
Chris from Kittery, Maine, wonders about the colloquial expression no sirree, Bob! or yes sirree, Bob!, which is an emphatic way of saying “definitely not!” or “no way!” The sirree (sometimes spelled with one r, as siree) in...