A casual way to say 'love' between friends, not meaning anything sexual. However it is somewhat serious.
The origin is blurry, it is a mix between love, luv and waffle.
1.) The verb form of "affection;" the act of being affectionate. To demonstrate physical affection, especially in ways that do not have specific other names. Ie to nuzzle, cuddle and pet. Explicitly innocent and nonsexual - one "wuffles" a lover the same way one wuffles a child or pet. May imply an emulation of the way an animal demonstrates affection, ie, how a cat will rub its face up against someone.
2.) A dimunitve form of nonromantic, nonsexual love in the sense of affection or fondness. Used to express the desire to give affection towards someone being cute or endearing.
1.) He caught her up in his arms and wuffled her ferociously. The cat jumped into their laps and joined the wuffling party.