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The person: "Pappy" (Man or Woman)
The behavior: "Brake-happy" (Putting on the brakes too frequently and often un-necessarily).

This behavior is often displayed when behind the wheel of (any) automotive device.
"Oh no, I've got a 'Brake-happy Pappy' in front of me!"

"There goes the road! A 'Brake-happy Pappy' is amongst us!"
by heartley99 May 14, 2010