It is an internet joke my friend, old as the cosmos.
There is a certain subset of forums posters that seeks to draw attention to themselves in any way possible. If they manage to charm a member of the opposite sex to spend time in their company via chloroform or threat of deadly force, they tend to want approval from their fellow members of the internet world wide superhighway.
This tends to manifest itself in an otherwise normal post that contains a reference to their hostage that makes no sense in the context of the post. A textbook case (if there were a textbook for the internet) would be like so:
Yeah I think Final Fantasy VII is clearly the best game ever. They spent a lot of time on the graphics and it really shows. I showed the game to my girlfriend once after I let her take her blindfold off. The best part of the game is when Will Smith punches that alien in the face.Though it is not a requirement, the post is usually bland and uninteresting, leading the reader to infer that its sole purpose is to:
- Assert that the poster has a girlfriend
- Assert superiority to those who do not
The appropriate response to any post like this is to quote the post, delete the text from the quote, and replace it with MY GIRLFRIEND or whatever the phrase was in capital letters.
Variants of the theme include MY SIGNIFICANT OTHER, MY LIFE PARTNER, MY FERRARI, MY PLAYSTATION 3, RICHARD DAWKINS, MY BREASTS and the closely related HAY GUYS I AM A GIRL.
Those who are "in" on the joke signify their intent to avoid making nerds cry by taking care to remove spurious references to success with attractive people or, when circumstances require a reference, ensuring that you capitalize the reference in your own post so you cannot be the butt of the joke, kind of like how Godwin's Law is only in effect until someone invokes it.
We actually had a good practical example with goKi's MY LIFE post a few weeks back.
*edit* burning hot is the only way a shower should be and any man that balks at the chance of a steamy hot shower with a lady should immediately be under suspicion of having contracted the gay