Definition
Someone who excels at mental gymnastics; a person who thinks creatively and effortlessly.
One who uses complex arguments to justify something that is otherwise unjustifiable.
How People Actually Use It
The act of trying to justify actions or validate opinions not supported by any facts. A means of dealing with cognitive dissonance.
""Hey Jessica, you're really pretty today." "Oh so you're saying that yesterday I was looking like shit. Also you're saying that because I'm a white fit woman. That makes you a pathetic misogynist and racist. Let's not mention the fact that if I didn't pander to your sexuality, I would be called unattractive and ugly. You, John, are a dumbass and a patriarchal pig, do you know how stressful it is to be a woman and having to look sexy 24 7 just so men get horny in this society? You don't, because you are such a privileged white male." "Wow Jessica that was some serious mental gymnastics you did right there...""
Source: Urban Dictionary