Totally a guess, but I think it was the Smallville Post.

I'm no help at all, huh? wink I checked the script but apparently that was an ad-libbed line because the only time "Smallville" shows up in the script for "Man of Steel Bars" is Clark saying "I can't go back to Smallville."

<shrug>

Sue
(now humming "Don't Go Back To Rockville" but substituting "Smallville"...)

Lois: You know, I have a funny feeling that you didn't tell me your biggest secret.

Clark: Well, just to put your little mind at ease, Lois, you're right.
Ides of Metropolis