Can you give some kind of context? The only usages apart from that of being a gun that I know are "shotgun marriage" or "to ride shotgun".
Sorry, no context, Anglika. Please forget about this question. I was just wondering while i was reading a book. But, as you could see when you marked my first post of the thread, i have been reading for too long today and i need a rest! (de instead of the - Good God in heaven!)
You know it happens (to me) when i am tired, i see too many weird senses concealed in every word (lol or, in spanish, Juas juas)