A physical act that involves running at your target, usually another person, then jumping and twisting in such a way that your ass lands as high up on their body as possible (preferrably the face). This act can be performed from a higher location, such as a bench or car, in order to get your ass as close to the target's face as possible. The only requirements to qualify as a Flying Buttress are that your feet leave the ground, and that your ass hits the target before any other part of your body. A knockdown is considered a bonus.
Everyone feared Tony's Flying Buttress' because he usually performed them without pants.
The act of leaning forward over the toilet with one or more hands on the wall in front of you to support your weight while you attempt to urinate. This act is usually related to morning wood as it requires either extreme downward force or tilting of the entire body to properly aim before urinating.