"'Then shall we hatch a plot to antler him, my precious?'"

This refers to the old European practice of cuckoldry, whereby a man would be publicly ridiculed if his wife had been unfaithful to him.  The word 'cuckold' comes from an old French word for 'cuckoo', just as we have the expression 'a cuckoo in the nest'.  Legend has it that the deceived husband would be forced to parade around the town wearing a pair of antlers, to demonstrate the idea that everybody else could see something obvious, aside from him.