rookie mistake

An egregious error (or altogether unwitting, on the other end of the spectrum of awareness) resulting in a response ranging from a harmless prank to serious vandalism (Localized to York, PA)

It was a major rookie mistake for him to leave his car door open!

by Eric Conlon July 23, 2003

wookie mistake

Similar to a rookie mistake but broader in scope and consequence.

Saying he could have a party that weekend was a major wookie mistake.

by Eric Conlon July 23, 2003