What is "oohing"

Usage examples of "oohing".

The girls were eagerly examining the various portraits hanging on the walls, oohing and ahing with admiration.

Wandering into a room where she shouldn't have been wandering, with me and Angela not far behind like we shouldn't have been, she suddenly started oohing and ahing again.

The old woman rolled and slid, oohing and woohing, down the stairs, Chistery chasing after her in consternation.

Sh'im were oohing and ululing softlywhether it was out of courtesy for the newborn or because there was only one offspring to be shown Nimisha didn't care.