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1.
An individual who is such a jag, he supplies enough jag to fill a wagon, if one felt the desire to do so.
Guy 1: Man, I heard that person is such a jag.

Guy 2: No joke, he's a jagwagon and a half.
by Piotor Rasputin December 11, 2010
 
2.
When a guy "jags" himself all the time, he's referred to as a jag wagon. Jag = Jack and wagon = penis.
Jimmy is always busy jagging his wagon in the bathroom. He's such a jag wagon!
by Psychodrama January 02, 2012