A one inch penis, or a very small penis when arroused.
The man showed the woman his one inch wonder
by someguy March 30, 2005
The one inch wonder is a wang that is 1 inch. It's not as good as the 2 inch tornado, but it beats the half inch disaster, but then again, it will never beat the quarter inch killer.
Hey look at that kid with his one inch wonder acting all cool and shit, he wished he had the quarter inch killa.
by quarter inch killaz r c00l yo January 10, 2006