An often used synonym for a man's penis.
Hey baby, Big Johnson's back at my place waiting for you."
by vector August 21, 2004
One who has a larger cock than normal, people with the last name Johnson have a 100% Bigjohnson rate.
Wow you have a Bigjohnson, I can't wait until its inside me, but I'm a bit scared that it won't fit.
by Cocka December 15, 2007