She wrote the "Toffee-Tastic is a bleak, flavorless, gluten-free wasteland", while calling the Samoas a "caramel-chocolate-coconut victor".
Charlotte McCourt, 11, sent a scathing review of every cookie in an email to a family friend who ended up buying some boxes. In an effort to boost that number, she rated each of the Girl Scout cookies on a scale of 1 to 10.
That friend happened to be tv personality, Mike Rowe, host of shows such as "Dirty Jobs". The video now has more than 8 million views.
"I love being honest with my clients", McCourt wrote in her letter. "I'm telling you, it's as flavorless as dirt", Rowe read.
Trefoils apparently "pair nicely with a hot drink" but are otherwise "boring".
A day later, sales on Charlotte's cookie-sales website zoomed, with more than 7,000 boxes being donated to troops and more being ordered.
There's also a section where you can learn the history of the cookie tradition and get recipes for using the cookies in desserts like Thin Mint Mocha Ice Cream Sandwiches and Nutty Caramel Turtles made with Peanut Butter Patties.
Do-Si-Dos: "I give it a 5 for its unoriginality and its blandness".
On the Somoa, "wow, the Somoa, I give it a nine!"
"When I was younger, I just got relatives to buy cookies", she says.