My speculation: hoo is a sound made with an exhalation of breath that expresses wonderment or disdain.

The guidelines for the competition outlined the government's wish for a building or buildings that would express 'soaring wonderment'.

He expresses wonderment at the fact that the "great halachic authorities" have not published rulings on this subject and reluctantly agrees to issue a ruling himself.

Asked about the morning of March 21, 1992, Mr. Catalano expressed wonderment.

Wide eyes seemed to express controlled apprehension - or perhaps wonderment.

Also, a Warrow exclamation used to express wonderment.

I expressed surprise and wonderment, but when a rug was unfurled, I felt miserable.

And both men expressed remarkable wonderment at key questions regarding the positions they are in.

Its effect is to express wonderment, drawing the reader to re-read the verse.

She only asked, like a girl expressing sweet wonderment at a reward too great: "I shall become as you are, lord?"