0I think it comes from fishing -- it means something like "okay, I'll take your bait/I'll bite your hook/you've caught me." We say it when someone has teased or tempted us with a question we can't guess the answer to.02br 02br 00I'll bet you'll never guess what my husband got me for my birthday!02br 02br 00A mink coat?02br 02br 00No, s