First let's talk about tonto. And I'm not referring to the Lone Ranger's faithful Indian companion. If you don't know who the Lone Ranger is, and don't mind learning a bit about old American TV shows, you can check out this link. Or maybe you just want to take a walk down memory lane. Anyway, I digress.
Let's get back to the word tonto in Spanish, which is what we're here for.
Tonto means silly or dumb, which can be an insult, heavily dependent on the context of how it's used, and your tone of voice. There are a number of phrases that involve the word tonto, like no seas tonto - don't be silly or no te hagas el tonto - don't act stupid. Tonta if you're talking about a woman.
Now that we know something about the word tonto, let's get back to our expression.
¡Qué tonto soy!I'm so stupid
Our translation sounds a bit harsh, but it's meant to be used in those situations where you make a silly mistake, and you say to yourself "I can't believe I did that" or "I'm so stupid".
Pan comido (easy), right? We're almost done here, just one more thing to talk about.
Remember in the beginning of this post I said I actually needed this phrase today? Well I'm about to tell you why.
I just posted about a very witty phrase "¡Ya llegó para quien llorabas!". Well, that's what I wrote. It should've been "¡Ya llegó por quien llorabas! ". ¡Qué tonto soy!
I corrected the original post, but I want to make sure my faithful readers are aware of my blunder. Learning Spanish is hard enough, and you don't need me to make it any harder for you! If you haven't read about "¡Ya llegó por quien llorabas! ", you can find the entry here.