the job in question is ejaculating during sexual intercourse. the origin of the phrase also relates to breen, in particular his inability to finish the job on two non-consecutive occasions.
the first time was with a rank year ten slut who was probably so loose that no friction was created, and therefore no-one would've been able to finish any kind of job up in there. this also led josh to make 'breen' calls on the female in question, but i digress...
the other time was when he was receiving head from his 'so-called girlfriend' (that's a direct quote) and he was unable to come. his excuse - he'd been so excited at the prospect of getting head that he had to wank.
what a fucking animal.
breen is totally incapable of finishing the job.
of course you won't be able to finish the job if you mazz before getting head.
this word is fairly recent in origin. it comes from the aranmore leaver's jumpers which were created by some ignorant fool in the summer of '04. if you don't know what these things look like, you're very lucky because they are the trifest pieces of shit out.
"let's go and burn the aranmore leaver's jumper!"
"woodley reminds me of the aranmore leaver's jumper - both are epically trife!"
"who the fuck designed the aranmore leaver's jumper?"