"a gimme is a shot that the other players agree can count automatically without being actually played."Please for the love of cold beer bring into play the "Other players agree" not the "oh hell I don't feel like trying this 2 foot putt on tournament 12 greens" for 5 straight damn hole while I putt out and they win a hole and take 5 skins.
A gimme is not official, opposite to a concede. Thus, different definitions have their standing.
WGT's "selfie" gimme exists only in practice games, or for low tiers. Avoid both and you won't suffer any more.