1. A boob placed on the head of another person which simulates a hat.
1. The act of placing one or more boobs on another person's head.
Also, a note on boobhatting, from a seasoned expert: "Boobhat related injuries, including herniated discs, quadriplegism, suffocation, and chronic priapism are on the rise. Please remember that the boobhatting lifestyle requires commitment and training. Parents, teach your children to start small, train hard, and never take more boob on their head than they can handle."