Extra affirmative. Derived from fo' shaganoff, follows the evolution of the term, in which the suffix determines the affirmative or negative negative nature of the term, off being negative and on being affirmative. Can be pluralizied.
Him: Hey, is it good to screw fat and/or ugly girls?
Me: Dogg, fo shaganOFF.
Him: Hey, you like having sex with hot girls?
Me: Dogg, fo shaganons.