var. WHOO int.

1

a. 1658.  Cleveland, Content, Poems, etc. (1742), 248. The chattring Sembriefs of her [sc. the owl’s] Woo hoo, hoo.

2

1851.  Mayne Reid, Scalp Hunt., I. xviii. 231. An owl … hovered around our heads—uttering its doleful ‘woo-hoo-a.’

3