n. The main character of the 2008 film "Wanted"
v. To snap and finally tell off the people in your workplace, school, or other parts of your daily life, in the most dramatic fashion possible. May involve screaming "SHUT THE FUCK UP!" without warning and at the top of your lungs, delivering a tirade amongst your equals, and/or smashing a back-stabbing, good-for-nothing best friend's face with an ergonomic keyboard
Guy: Dude, my boss got on my case again yesterday, and I finally Wesley Gibsoned out of there once and for all.
Friend: Wow, I bet you really let them have it, huh?
Wesley Gibson: "I understand. Junior high must have been kind of tough, but it doesn't give you the right to treat your workers like horse shit, Janice. I know we laugh at you, Janice. We all know you keep your stash of jelly donuts in the top drawer of your desk. And I want you to know that if you weren't such a bitch, we'd feel sorry for you. I do feel sorry for you. But as it stands, the way you behave... I feel I can speak for the entire office when I tell you... Go fuck yourself."
adj. to be sorry or remorseful for something that wasn't your fault or had nothing to do with you; to say you're sorry when it is unnecessary.
Taken from the main character of the film Wanted, who often said sorry for things he didn't need to be or things that were not his fault.
Jay: You really just made a reference to that "singing shark" guy from YouTube?
L: I'm sorry!
Jay: Don't be Wesley Gibson.