"jobby dobber": Lochwinnoch variant of the word "jobby: meaning poo or shit, or preferably shite; "dobber" meaning willy/penis/cock/punter/wang. The phrase translates in English as "shitty dick".
"Jobby Dobber": As in, "Last night I got a shitty dick, a shitty dick, a shit on my dick" (courtesy of Fuck Hogg and Gang).