When a foxy lady attempts to seductively tease her date, such as by wiggling her bottom, only to have the tease interrupted by hitting her head on an unnoticed object.
My girlfriend tried to tease me into following her into her car by seductively shaking her butt as she sat back into the seat, but I burst out in laughter when she wigglebonked her head on the roof of the car.
A person who acts amazingly stupid in the most hyper active ways. Most people who are like this will have lack of sugar intake or people who get easy sugar rushes. If you think you know someone who is a Wigglemuff the main symptoms are: 1. They act really daft at random moments 2. They will have a history of anger issues 3. And finally they will act out no matter what the situation.
"Man that guy was totally hyperlast night, but he was acting really stupid at the same" "Yeah he was being a total Wigglemuff"