It seems that on some imageboard sites, certain memes have undergone a transition from a "memes as such" state, i.e. where delicious cake refers to the concept of the pastry, into a "general concept" state. When a meme becomes a general concept (such as cake, whether specified as especially delicious or not) it will have acquired a more general meaning besides the immediate dictionary sense(s).

That is to say, these days delicious cake does not refer to pastries anymore except in an archaic manner (which will certainly be subsequently exploited for humour).