Bluh-kyaq!

Onomatopoeic interjection used to describe something unexpected (particularly of unusual size or swiftness) appearing in close proximity, particularly to one's face

Man, I turned around and your sunglasses were like "Bluh-kyack!" all up in ma face.

Person 1: Man! I can't believe you just slapped me like that!
Person 2: Bluh-kyack!

by K Wheezle May 25, 2004