tonguethesaurii

Hm.......actually,is  boo  an onomatopoeia? As the sound of a bovine  animal, ofcause,

but as a (super)human sound?

Yes, i guess it's more than likely that  the frightening boo  originated in the neolithicum,when

people as a joke unexpectedly made the sound of an aurochs behind eachothers back.