www.alphadictionary.com

Whether it culminate in romance, or become the sophomoric "Woo-Woo" which, with an exagerated roll of the eyes, reference to the honeymoon night.

Seven years late, but here's what etymonline has to say:

Old English wogian "to woo, court, marry," of uncertain origin and with no known cognates; perhaps related to woh, wog- "bent, inclined," as with affection.

I also found out that the slide for a Scout's kerchief is also called a woggle.