L-Plated
To mess up big time like a brain-dead toddler who just learned to walk. Mostly used by clueless kids at King's College, Auckland, and their stupid friends. Usually said with words like idiot, loser, and buttface.
He L-Plated the entire math test by drawing a mustache on every number.
She L-Plated her speech by accidentally saying her teacher's name was 'Captain Spaghetti'.
He L-Plated the soccer game by tripping into the goal and knocking the goalpost over.