Describing or pertaining to one's innability to accomplish their motives. When one tries to be something they are not. Can also pertain to inanimate objects.
Look at that fake-ass player trying to draw that girl in with his fake-ass spinning hub caps.
Used in similar context to "for sure" or "hell yeah", when expressing acceptance or accordance with an idea or action.
John: Hey man, are you gonna come over and chill later?
Jack: Forsurezy bro, wouldn't miss it for the world!