After a loss in sports, skills, a bet, or fantasy football, somebody gushes about how gracious they are in the loss and how they're so happy for the other person that won; they shower them with praise for just having their ass kicked.
Dutch got his butt spanked by Oooohhh yet again; even before he was done losing, he sent out a congratulatory text; what a flufferloser move.
A fluffernutter is an overly zealous or eager person.
On a pornographic set, the fluffer is charged with the responsibility of keeping an actor's penis erect without causing him to ejaculate. The fluffernutter fails at their sole job requirement when their enthusiasm triggers a "nut".