interj general expression of surprise. Much akin to “God,” or “bloody hell” in that context (but without the ghastly use of our saviour’s name in vain or any swearing). It’s quite all right to use in polite company, though perhaps a little antiquated. More likely to be heard in a context like: Crumbs, that’s more expensive than Harrods rather than: Crumbs, I just dropped the smack out the window.