WTF Charles means the same thing as WTF 'What the Fuck'. It’s from a voiced over X-Men cartoon starring the Juggernaut.
It’s a scene where Professor Charles Xavier is having an image in his head in which the Juggernaut sees this and proceeds to say "WTF Charles?!" to Professor X.
A friend and I altered the regular WTF with this one because we thought it was the funniest part of the Cartoon and it just sounded better to say WTF Charles?! instead of the old boring WTF. It is pretty funny because we come across people that know what we are talking about when we say WTF Charles. They are like "Dude, the Juggernaut!" Haha.... oh well I thought i'd share the new and improved WTF phrase.
If you would like to see the video, just goto any video search website and type Juggernaut in the search bar and it will come up.
Bob: "Dude, did you hear that Bruce came out of the closet?"
Steve: "WTF Charles?!"
:::You hear a weird noise in the distance:::
You: "WTF Charles?!?"