Two things I have a weakness for have combined forces under the Wendy's logo in order to make my arse even wider than it already is. Dastardly.
And honestly, the only disappointing thing about the Coffee Toffee Twisted Frosty is the name. Because if you can say it out loud without feeling foolish then, well, good on you. When I ordered it I left out the "twisted" part. I figure it's inherent: if you really want an milkshake-ish drink that tastes like a touch of coffee added to chocolate with bits of broken-up toffee in it, then you're already pretty twisted.
The drink itself is tasty. It's sugary and has a nice coffee mocha taste to it, which is punctuated every time you suck a fragment of toffee up the straw. (I eschew spoons when it comes to Frostys. I know, I'm weird like that.)
While all of this is a decent taste while helped by the toffee--the real magic moment for me was getting to the sludge at the bottom, which was not only melted Frosty...but all the bits of toffee leftover. Getting all of that at once is a bit of punctuation, sure, but it's a nice exclamation point.
Is it the most evil thing you'll consume this week? Probably not. But it's close. And not unworthy if you're in it for the sugar and the toffee bits. Hardcore coffee achievers probably will just yawn.