Definitions by M.N.M.

Sanderson 

When someone picks their nose, nails or various blemishes (zits, moles, warts, etc.) on their face and eats it or flicks it on other people.

"He's so gross! He's such a Sanderson."

"Ewww did you see what he just did? He just pulled a Sanderson."

Sanderson by M.N.M. January 5, 2009