Their big yellow 'M' is what this term referz to.
Staff: Thatz one McCoke.
Customer: Forget it ya McWanker, I'm off to Burger King...
(I know itz not a proper example but who givez a shit, this is funnier)
2. A pun on them - their fries when eaten in significant quantities make your shit turn gold - so your ass turns into the golden arches when they are on the way out
3. In sex - when two people urinate on one person
2. "Man, after the bar I went to the Golden Arches and the next day I had to deal with the Golden Arches."