The term dubbed, "dicking a dick-sandwich" originated in a hotel whereby three 'mates' decided that two of them would press their exposed genitalia against one another, getting erections in order for their dicks to press against one another horizontally in a 2D fashion for the third 'mate' to then insert their dick into the 'sandwich', such as vaginal sex. This methodology is referred to as forming a sandwich, one structured through the building blocks of dicks. This is also known to form a 'tri force of dick', being the limit break most commonly referred to as the 'Dick of Courage Swipe'.
It is sometimes known that the two men forming the 'sandwich' hold their dicks together at their respective bases to strengthen the structure.
Upon explanation of the concept to an exterior source one question was asked,
"Should it not be therefore called fucking a dick-sandwich?"
Upon inquiry this question was swiftly met with the previously discussed answer,
"No, because one is putting ones dick in the aforementioned 'sandwich', therefore eliminating that this could be done without the use of a strap-on by a female."
M1: "Hey, we have been thinking and, do you want to put your dick in between ours?"
M3: "Yes, please form a sandwich with your penises so that I may proceed to fuck the gap."
M2: "So you want to be dicking a dick-sandwich?"