A form of onomatopoeia. Often used when referring to the noise a cat (or feline of any sort) makes when falling from a train moving at 66 miles per hour headed for San Fransico.
Pete: "Hey Chuck, what's up?"
Chuck: "I dunno...."
*suddenly* Feline: "BLAZAH!"
Pete: "Woah! What the hell was that?"
Chuck: "I dunno, but it sounded like a cat falling from a train running at 66 miles per hour headed for Boston."
Pete: "Noo.... more like San Fransico."
Chuck: "Yeah,you're right. What was I thinking?"