The term used to illustrate what happens when a person uses Listerine and immediately proceeds to perform fellatio.
Young male: Wait, wait! Before you do that, could you go rinse with Listerine?
Young female: What the fuck? You think my breath stinks? You think I have herpes? What the fuck is wrong with you?
Young Male: No, no! I just thought we could spice things up a bit, you know?
Young Female: What? I don't give good enough head? I'm fuckin' breaking up with you right now. We are done.
(she gets out of bed, starts to get dressed)
Young Male: You give great head! You could suck a golf ball through garden hose!
Young Female: Oh so now I'm some dick-crazed whore? I fucking hate you.
(storms out of the room, with her bf following desparately)
Young Male: I can explain! I just read the definition of listerjob on urbandictionary.com and I thought it sounded really fun! You've got it all wrong!
Young Female: All wrong eh? You think I'm a fucking moron? I don't know why you have to be such a douchbag queerbait - wait, did you say urbandictionary.com?? I love that site!
(she smiles and seems very elated all of a sudden - clearly she's bipolar)
Young female: Okay so where's the Listerine?
Young male: (in his head) Yesssssss. (to his gf) In the bathroom sweetie!