If what you’re talking about is specifically the song from Mercenaries 2, then that’s one thing.
If you’re talking about the phrase “Oh no you didn’t” then that’s another.
There’s nothing in my mind that would suggest the song from the ads for the game had anything to do with the popularity of the phrase. People have been saying “oh no you didn’t” TO DEATH since the 90’s.
If you are talking about the song from the game, then what? Are there remixes of it? Is there a dance that goes to it?
There’s just not a lot about most ‘90s slang that strikes me as “internet culture” unless it’s presented as nostalgia.
If you can show me evidence that the Mercenries 2 ad that used the song in any way drove many people to share it, make reference to it, make jokes about it, or do covers of it in other styles, then that would be awesome.
But when I search for it, I just get a few copies of the song itself (which is funny, btw) and a piano tutorial, and some things that aren’t really related. http://www.youtube.com/results?search_query=%22oh+know+you+didn%27t%22&aq=f