If I hadn't been present at that table, I never would have heard that throwaway line about the hot dog.
如果我没有到那张桌子旁边,我就不会听到他们 关于热狗的随口一说。
英语百科
Throwaway line
In comedy, a throwaway line (also: throwaway joke or throwaway gag) is a joke delivered "in passing" without being the punch line to a comedy routine, part of the build up to another joke, or (in the context of drama) there to advance a story or develop a character. Throwaway lines are often one-liners, or in-jokes, and often delivered in a deadpan manner.