When you are at a restaurant and everyone is waiting to order you claim you are going to order something, when the waiter actually takes your order you choke under the pressure and order the same thing as the guy before you.
An example of somebody pulling The Musselman Choke is:
Person 1:i think i will get the waffles
Person 2: I'm gonna get pancakes
Waiter: what could i get you guys?
Person 1: can i get the pancakes
Waiter: and for you?
Person 2: uhhh can i get the pancakes, too
Person 1: Dude, you just pulled The Musselman Choke