Come on, let's blow this popsicle stand

I can tell you what it means, but...

In Santa's Secret Stuff, season 7, Rory and Lorelai are trying to get candy-cane coffee from Weston's... unsuccessfully.

Then they talk briefly about Christopher and Luke's character reference, and Lorelai says:

"Come on, let's blow this popsicle stand."
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Rory uses the same expression in episode 2 of the same season, That's What You Get, Folks, For Makin…