Best definition
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.