The "guy" in question is revealed to have a very active online habit, including posting to Television Without Pity.com. In real life, Gregory Thomas Garcia
(creator of _"My Name Is Earl" (2005)_) had been posting in the forums at TWoP as this character months before the show aired, and in fact posted his line the night before the episode aired. The following day Joy and Crabman made posts under his user-name WhoJackie. See more
Why do you care so much about this guy anyway?
'Cause he came to visit me last night in my dream.
That's just your conscience, stupid. Ignore it. That's how I got through cheating on you all those years. Please, you know how many times I saw you standing on the hood of my car while I was humping Darnell.