Definitions by Gardineroso

Jonking 

Verb, to Jonk. Effectively means to masturbate while engaged in the act of defecation.
It’s roots are the Scottish colloquial terms ‘jobby’ (defecate) and ‘wank’ (masturbate).

"Johnny's off to the toilet for a jonk... make sure he's locked the door"

Jonking by Gardineroso September 16, 2003