Or it could be used as what your ocupation is like if you work at McDonalds thats a suckjob....
Teacher: wow david you did your homework the only problem is you did a "suckjob"
Dave:(walks away being emo)
Kevin: Dude that's down right awful, when its my sister feel free to say slurpie.
GRAHAM: sorry, but i called in to see greg and she gave me the best fucking suckjob imaginable
TREVOR: graham!! what have a i told you about greg?
GRAHAM: fuck off trevor greg is fair game
-Oh man it was great she gave me a suckjob bro and my shlong just inflated like a fucking balloon man.