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1.
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