Sentence:  "It is the "Festa della Madonna dei Capri"—the Feast of Our Lady of the Goats. We have it every single year. Everybody is out!" ... The goats, fairly strutting with pride, however, are the most ludicrous members of these amazing cavalcades, for they have bouquets attached with wire and toothpicks to twisted horns and even to their sub-tails, which <WSD>wigwag</WSD> signals as they bob along with arched necks. 
Meaning of the word marked with <WSD> tags:  To move gently in one direction and then another; to wig or wiggle, to wag or waggle.