http://www.eatmedaily.com/2009/03/the-m ... eseburger/
The McGangBang: a McChicken Sandwich Inside a Double Cheeseburger [a chronicle]
The McGangBang ranks up there in the holy pantheon of WTF. It's a sandwich made from a double cheeseburger and a McChicken sandwich — where you put an entire McChicken sandwich inside a double cheeseburger. It's a creative manipulation of existing menu items, and an exercise in frugality: taking two items off of the Dollar Menu and creating an entirely new sandwich for a total of $2.16. Truly, it's a sandwich that's more than the sum of its parts.
The naming, of course, is somewhat obscene — "gangbang" is defined as "sexual intercourse with multiple partners in turn or at the same time." It's illicit in more ways that one — chicken and beef most definitely make for an unnatural pairing.
In addition, it's sort of a subversive act for people to order it by name, as well as a thrill to confound the McDonald's employee with an order for a McGangBang — so much so that people are documenting their experiences at drive-thrus and counters on YouTube
In some locations, the McGangBang appears to have become part of the McDonald's employee lexicon — explanation is unnecessary — they know how to make it, much like the off-the-menu items at In-N-Out.
An oft-repeated quote from user DasKosmischeVonUT on the VWVortex forums sums it up:
It's kind of like having a threesome with two ugly chicks. While it's happening you're stoked, because hey threesome!!! But once you're finished it kinda sinks in about what you've done.
We just had to do some research — we searched high and low, with Google, messageboards, YouTube, Flickr, and Twitter. Its origins are elusive — even how it's made varies — but what we do know is that it dates back to at least 2006. Herein we collect every bit of information we could find:
Official Statement From McDonald's
We contacted McDonald's to get an official statement regarding the McGangBang, and this is what they emailed us:
“McDonald’s loves to hear from our valued guests, especially when they customize and create meal combinations to fit their personal taste preferences – no matter how unique!
Whether it’s requesting an Egg McMuffin without cheese or a Big Mac with extra secret sauce, McDonald’s is proud to satisfy our customers’ requests and provide them with a variety of great-tasting meals every time they visit our restaurants.”
Danya Proud, Spokesperson
McDonald’s USA
Bonus: the Unprotected McGangBang
There's also an "Unprotected McGangBang" — Urban Dictionary calls it "different than McGangBang because there is a spicy mcchicken instead of a mcchicken."
i think the Thompson McD's just started to look a whole lot dirtier...
but what can I do but take it? 
