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At full speed, going as fast as you possibly can. (Australian)
"We were fully gunning this old HQ Kingswood totally FLATCHAT downhill with a tailwind, and we still couldn't get away from the copper on his pushie."
by Alex From Oz October 04, 2007
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2
He is flat chat on other work today and will get back to you tomorrow.
by odelay February 23, 2012
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3
An Australian slang word meaning to go at the maximum speed possible. To push yourself or your vehicle to the extreme of velocity.
"Wow, that car is going flat-chat! It's out of control!'
by Sir Glame November 11, 2010
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