A clever derivitave of "fucked". This variation allows a more public application of its origin, all-the-while maintaining the intended emphasis and can be used anywhere in place of "fucked".
A public way of saying "I made a hugef*n mistake and now I am screwed".
For example, you go on a date with a girl and make the moves on her, you call her "sweetie" or "sweetheart" and make her think you are really into her, but you really are not. You realized your mistake and publicly proclaim to be "Blunder fooked".