I reject being called an idiot depsite answering both interpritaions of your OP. However I agree with you in part who would have thought a metaphor would confuse people so much.
How do you not know what that expresion means. Wow thats bad. Anyway it hasn't happend to me. Acctualy my accounting teacher said she would recomend me for a full time job in the accounting department of a local buissness that is hireing. To bad I'm still in high school.