Once upon a time, there was an image board called /v/. Someone had created a picture with Aladdin with the subtitle: Bomb? I don't know what you're talking about! This spawned a few spin offs, but not many. Why not so many? Simple, there was no exploit. A lack of an exploit caused the meme with much potential go to the lavatory and never return. Many months after, a man named McNab found the same exact image.

Shortly after, he made this exploitable using Flash MX 2004.

He then went to the wonderful lands of Facepunch to share his creation.
He clicked and typed his way over to the glorious land known as Photoshop Contests , and swiftly made a thread entitled "I don't know what you're talking about!". The residents quickly responded with funny edits of his exploitable and his thread quickly grew in popularity and (hopefully) a meme was born.

The original thread:

http://www.facepunch.com/threads/1054019-I-don-t-know-what-you-re-talking-about!